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A 404 Not Found Error can mean big trouble for an online store and its customers. Sales and customer satisfaction will drop. It is a lose-lose situation in Ecommerce.

Now, because I know you all are winners, we aren't going to lose out with this pesky 404 Page Not Found Error (not to be confused with the Error 500 Http Internal Server).

I’ll explain the Error and show you how to fix it for your Online Store. The next time you see this error, you’ll have the knowledge needed to fix the error fast and continue to make sales.

How to Recognize the 404 Not Found Error

There are many different ways that you might see this error message on your computer. Be aware that 404 Pages can be entirely customized by the owner of the domain. It can show up any way imaginable but these are some common words that you can look for to know if the Error you see is an HTTP Not Found Error 404

• '404 Error'
• '404 Not Found'
• 'The requested URL download-failed-because-resources-could-not-be-found.html was not found on this server.'
• 'HTTP 404 Not Found'
• '404 Page Not Found'

The standard HTTP 404 - Not Found Error Page will be a white screen with simple black text. Here is a screenshot of a basic 404 Page that you might see:

Remember that the 404 Page Not Found Error can be completely customized. Here is what GitHub’s 404 Page looks like:

The Default PrestaShop theme has a slightly customized 404 page as well. Here it is for our version PrestaShop 1.7.

What is the Not Found Error 404?

The HTTP 404 Not Found Error means that the webpage you were trying to reach could not be found on the server. It is a Client-side Error which means that either the page has been removed or moved and the URL was not changed accordingly, or that you typed in the URL incorrectly. Put simply, a 404 Not Found Error means that the webpage simply does not exist with the URL entered.

Simple Steps to Solve

There are some simple tips you can try to solve this problem from your end. We will go over some advanced troubleshooting tips later. In any case, you should try these tips first because many times, the 404 Not Found Error can be solved rather quickly.

Refresh page

The first thing you should do is simply refresh. You can press Ctrl+F5 to force a refresh on the page. The error may appear just because the page wouldn’t load.

Clear browser’s cache and cookies

If you are able to visit the page from another device, such as your phone, clearing the cache and cookies will usually solve the problem.

Check the URL

Make sure that the URL inputted correctly. This includes spelling of the URL, correct slashes, file extension of the page and so forth.

Scan for Malware

There are some malware files that will force a 404 Error on websites. It’s imperative to make sure your computer is clean and not compromised.

Contact the Webmaster

Go ahead and send a message to the webmaster and let them know of the 404 error. If you are the website owner then contact your hosting provider for more information. If the server is encountering problems, it may return 404 errors.

Advanced Troubleshooting

For PrestaShop store owners, a 404 Not Found Error can be frustrating. I’ll go over some of the most common causes and solutions for seeing a 404 Not Found Error on your Back or Front Office.

Many of these “common causes” actually concern the .htaccess file. I do not recommend playing around with this file unless you know what you are doing.

Solid Hosting Providers can walk you through setting up your .htaccess file and troubleshooting issues while having a PrestaShop Support Plan ensures that these errors get solved quickly by a PrestaShop team member.

WAIT! Before you start playing around in your Back Office and PrestaShop files, you must backup your entire Database and PrestaShop files.

Please read this post to learn how to backup, or have your hosting provider backup both your Database and PrestaShop files.

Now let’s get to solving the 404 Not FoundError.

• Deleted Pages -If you have deleted pages on your store, be aware that Search Engines may have already crawled and indexed the page. It can take some time (up to a month) for search engines to recognize that the page has been deleted. Your customers also may have bookmarked the page as well. It is a good idea to redirect your deleted products to a different page, like your homepage.

• Permissions - If you are getting a 404 Not Found Error along with a sentence that reads “You don’t have permission to access…” Then it’s almost certainly a permissions problem. You should tweak your CHMOD permissions via FTP, or call your hosting provider to have this changed. Usually, a good permission set would be 755 for directories and 644 for files. However, permissions vary by host, so be sure to check with them first.

• Memory Limit -You might receive a 404 Not Found error as a page that shows up because of a memory_limit issue with your host. Although the two are not directly related, it’s important to learn how to turn on Error Reporting. Turn Error reporting on and then reload the page with the 404 error, if you see an error that starts with “Fatal error: Out of memory” . Then contact your host to increase your memory limit.

• .htaccess Problems - The .htaccess is a configuration file used by Apache web-servers on your root folder that can, among other things, control redirects, protect folders, and change aspects of your URL’s. Many times you can solve 404 issues by regenerating this file. You can delete the .htaccess file manually through your FTP and regenerate it by heading over to your Back-Office/Advance Parameters/Performance. Sometimes, simply toggling the option for Friendly URL can do the trick by forcing the regeneration of the .htaccess file.

• SSL Certificate Incorrectly Configured - If you can receive a 404 Not Found error after your install your SSL certificate then your SSL Certificate is not set up correctly. Double check with your hosting provider to make sure that your SSL URL is pointing and connecting with the correct PrestaShop URL within the .htaccess file. In PrestaShop 1.5.6 + you have the option to Force SSL on all pages; in that case, you need to confirm that any page with content located within an iframe is called in https.

• mod_rewrite is disabled - mod_rewrite is an apache module that allows you to customize your URL’s (That is what Friendly URL is). If you receive a 404 error when you turn on Friendly URL, chances are you do not have mod_rewrite enabled on your server. If your Friendly URL is working but in your Back-Office/Advance Parameters/Performance you see a warning that says “No URL rewriting (mod_rewrite) is not active on your server, or it is not possible to check your server configuration.” Then the problem is not due to mod_rewrite. Some hosting servers have security features that do not allow PrestaShop to check your server configuration. If Friendly URL works, then mod_rewrite is installed correctly.

• Incorrect Custom URL Route-If you received the 404 error after you created a Custom URL route for your pages in your Back Office/Preferences/SEO & URLs , (Must have Friendly URL active and enabled). There is a strong chance that your custom route was not inputted correctly.

When in doubt: ask our PrestaShop forum

Once you get more information about the error, it is always a good idea to search the error in Google (Tip: Add the word 'PrestaShop' to your search and hone-in on the problem.)

You will find a plethora of information and tutorials about your error. Without a doubt, you will find some PrestaShop Forum threads with the [SOLVED] tag by them. Make sure to take the time to read those first.

If you cannot solve the problem after reading this post, researching on the internet and working with your Webmaster/hosting provider, you should definitely take the time to register and post on the PrestaShop Forums.

Please open a thread on the forum and our expert team of Community Mangers and Moderators will answer you. There you have it; if you follow these steps and suggestions you should be able to troubleshoot most all 404 Not Found Error pages.

Whether you are a customer on an Ecommerce website or the online store’s owner, a 404 Error can be slippery to find the cause and solve it.

With the knowledge you learned today, you are well prepared to navigate and solve any 404 Not Found error.

UPDATED 3/31/2016: We hope this article helps you address your issue. For answers to individual questions, you can post your question for free on our PrestaShop forum or contact our Support center and a representative will contact you with details on how you can get the help you need.

This article lists common point-to-site connection problems that you might experience. It also discusses possible causes and solutions for these problems.

VPN client error: A certificate could not be found

Symptom

When you try to connect to an Azure virtual network by using the VPN client, you receive the following error message:

A certificate could not be found that can be used with this Extensible Authentication Protocol. (Error 798)

Cause

This problem occurs if the client certificate is missing from Certificates - Current UserPersonalCertificates.

Solution

To resolve this problem, follow these steps:

1. Open Certificate Manager: Click Start, type manage computer certificates, and then click manage computer certificates in the search result.

2. Make sure that the following certificates are in the correct location:

   Certificate	Location
   AzureClient.pfx	Current UserPersonalCertificates
   Azuregateway-GUID.cloudapp.net	Current UserTrusted Root Certification Authorities
   AzureGateway-GUID.cloudapp.net, AzureRoot.cer	Local ComputerTrusted Root Certification Authorities

3. Go to C:Users<UserName>AppDataRoamingMicrosoftNetworkConnectionsCm<GUID>, manually install the certificate (*.cer file) on the user and computer's store.

For more information about how to install the client certificate, see Generate and export certificates for point-to-site connections.

Note

When you import the client certificate, do not select the Enable strong private key protection option.

The network connection between your computer and the VPN server could not be established because the remote server is not responding

Symptom

When you try and connect to an Azure virtual network gateway using IKEv2 on Windows, you get the following error message:

The network connection between your computer and the VPN server could not be established because the remote server is not responding

Cause

The problem occurs if the version of Windows does not have support for IKE fragmentation

Solution

IKEv2 is supported on Windows 10 and Server 2016. However, in order to use IKEv2, you must install updates and set a registry key value locally. OS versions prior to Windows 10 are not supported and can only use SSTP.

To prepare Windows 10 or Server 2016 for IKEv2:

1. Install the update.

   OS version	Date	Number/Link
   Windows Server 2016 Windows 10 Version 1607	January 17, 2018	KB4057142
   Windows 10 Version 1703	January 17, 2018	KB4057144
   Windows 10 Version 1709	March 22, 2018	KB4089848

2. Set the registry key value. Create or set “HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesRasMan IKEv2DisableCertReqPayload” REG_DWORD key in the registry to 1.

VPN client error: The message received was unexpected or badly formatted

Symptom

When you try to connect to an Azure virtual network by using the VPN client, you receive the following error message:

The message received was unexpected or badly formatted. (Error 0x80090326)

Cause

This problem occurs if one of the following conditions is true:

• The use user-defined routes (UDR) with default route on the Gateway Subnet is set incorrectly.
• The root certificate public key is not uploaded into the Azure VPN gateway.
• The key is corrupted or expired.

Solution

To resolve this problem, follow these steps:

1. Remove UDR on the Gateway Subnet. Make sure UDR forwards all traffic properly.
2. Check the status of the root certificate in the Azure portal to see whether it was revoked. If it is not revoked, try to delete the root certificate and reupload. For more information, see Create certificates.

VPN client error: A certificate chain processed but terminated

Symptom

When you try to connect to an Azure virtual network by using the VPN client, you receive the following error message:

A certificate chain processed but terminated in a root certificate which is not trusted by the trust provider.

Solution

1. Make sure that the following certificates are in the correct location:

   Certificate	Location
   AzureClient.pfx	Current UserPersonalCertificates
   Azuregateway-GUID.cloudapp.net	Current UserTrusted Root Certification Authorities
   AzureGateway-GUID.cloudapp.net, AzureRoot.cer	Local ComputerTrusted Root Certification Authorities

2. If the certificates are already in the location, try to delete the certificates and reinstall them. The azuregateway-GUID.cloudapp.net certificate is in the VPN client configuration package that you downloaded from the Azure portal. You can use file archivers to extract the files from the package.

File download error: Target URI is not specified

Symptom

You receive the following error message:

File download error. Target URI is not specified.

Cause

This problem occurs because of an incorrect gateway type.

Solution

The VPN gateway type must be VPN, and the VPN type must be RouteBased.

VPN client error: Azure VPN custom script failed

Symptom

When you try to connect to an Azure virtual network by using the VPN client, you receive the following error message:

Custom script (to update your routing table) failed. (Error 8007026f)

Cause

This problem might occur if you are trying to open the site-to-point VPN connection by using a shortcut.

Solution

Open the VPN package directly instead of opening it from the shortcut.

Cannot install the VPN client

Cause

An additional certificate is required to trust the VPN gateway for your virtual network. The certificate is included in the VPN client configuration package that is generated from the Azure portal.

Solution

Extract the VPN client configuration package, and find the .cer file. To install the certificate, follow these steps:

1. Open mmc.exe.
2. Add the Certificates snap-in.
3. Select the Computer account for the local computer.
4. Right-click the Trusted Root Certification Authorities node. Click All-Task > Import, and browse to the .cer file you extracted from the VPN client configuration package.
5. Restart the computer.
6. Try to install the VPN client.

Azure portal error: Failed to save the VPN gateway, and the data is invalid

Symptom

When you try to save the changes for the VPN gateway in the Azure portal, you receive the following error message:

Failed to save virtual network gateway <gateway name>. Data for certificate <certificate ID> is invalid.

Cause

This problem might occur if the root certificate public key that you uploaded contains an invalid character, such as a space.

Solution

Make sure that the data in the certificate does not contain invalid characters, such as line breaks (carriage returns). The entire value should be one long line. The following text is a sample of the certificate:

Azure portal error: Failed to save the VPN gateway, and the resource name is invalid

Symptom

When you try to save the changes for the VPN gateway in the Azure portal, you receive the following error message:

Failed to save virtual network gateway <gateway name>. Resource name <certificate name you try to upload> is invalid.

Cause

This problem occurs because the name of the certificate contains an invalid character, such as a space.

Azure portal error: VPN package file download error 503

Symptom

When you try to download the VPN client configuration package, you receive the following error message:

Failed to download the file. Error details: error 503. The server is busy.

Solution

This error can be caused by a temporary network problem. Try to download the VPN package again after a few minutes.

Azure VPN Gateway upgrade: All Point to Site clients are unable to connect

Cause

If the certificate is more than 50 percent through its lifetime, the certificate is rolled over.

Solution

To resolve this problem, re-download and redeploy the Point to Site package on all clients.

Too many VPN clients connected at once

The maximum number of allowable connections is reached. You can see the total number of connected clients in the Azure portal.

Point-to-site VPN incorrectly adds a route for 10.0.0.0/8 to the route table

Symptom

When you dial the VPN connection on the point-to-site client, the VPN client should add a route toward the Azure virtual network. The IP helper service should add a route for the subnet of the VPN clients.

The VPN client range belongs to a smaller subnet of 10.0.0.0/8, such as 10.0.12.0/24. Instead of a route for 10.0.12.0/24, a route for 10.0.0.0/8 is added that has higher priority.

This incorrect route breaks connectivity with other on-premises networks that might belong to another subnet within the 10.0.0.0/8 range, such as 10.50.0.0/24, that don't have a specific route defined.

Cause

This behavior is by design for Windows clients. When the client uses the PPP IPCP protocol, it obtains the IP address for the tunnel interface from the server (the VPN gateway in this case). However, because of a limitation in the protocol, the client does not have the subnet mask. Because there is no other way to get it, the client tries to guess the subnet mask based on the class of the tunnel interface IP address.

Therefore, a route is added based on the following static mapping:

If address belongs to class A --> apply /8

If address belongs to class B --> apply /16

If address belongs to class C --> apply /24

Solution

Have routes for other networks be injected in the routing table with longest prefix match or lower metric (hence higher priority) than the Point to Site.

VPN client cannot access network file shares

Symptom

The VPN client has connected to the Azure virtual network. However, the client cannot access network shares.

Cause

The SMB protocol is used for file share access. When the connection is initiated, the VPN client adds the session credentials and the failure occurs. After the connection is established, the client is forced to use the cache credentials for Kerberos authentication. This process initiates queries to the Key Distribution Center (a domain controller) to get a token. Because the client connects from the Internet, it might not be able to reach the domain controller. Therefore, the client cannot fail over from Kerberos to NTLM.

The only time that the client is prompted for a credential is when it has a valid certificate (with SAN=UPN) issued by the domain to which it is joined. The client also must be physically connected to the domain network. In this case, the client tries to use the certificate and reaches out to the domain controller. Then the Key Distribution Center returns a 'KDC_ERR_C_PRINCIPAL_UNKNOWN' error. The client is forced to fail over to NTLM.

Solution

To work around the problem, disable the caching of domain credentials from the following registry subkey:

Cannot find the point-to-site VPN connection in Windows after reinstalling the VPN client

Symptom

You remove the point-to-site VPN connection and then reinstall the VPN client. In this situation, the VPN connection is not configured successfully. You do not see the VPN connection in the Network connections settings in Windows.

Solution

To resolve the problem, delete the old VPN client configuration files from C:UsersUserNameAppDataRoamingMicrosoftNetworkConnections<VirtualNetworkId>, and then run the VPN client installer again.

Point-to-site VPN client cannot resolve the FQDN of the resources in the local domain

Symptom

When the client connects to Azure by using point-to-site VPN connection, it cannot resolve the FQDN of the resources in your local domain.

Cause

Point-to-site VPN client uses Azure DNS servers that are configured in the Azure virtual network. The Azure DNS servers take precedence over the local DNS servers that are configured in the client, so all DNS queries are sent to the Azure DNS servers. If the Azure DNS servers do not have the records for the local resources, the query fails.

Solution

To resolve the problem, make sure that the Azure DNS servers that used on the Azure virtual network can resolve the DNS records for local resources. To do this, you can use DNS Forwarders or Conditional forwarders. For more information, see Name resolution using your own DNS server

The point-to-site VPN connection is established, but you still cannot connect to Azure resources

Cause

This problem may occur if VPN client does not get the routes from Azure VPN gateway.

Solution

To resolve this problem, reset Azure VPN gateway. To make sure that the new routes are being used, the Point-to-Site VPN clients must be downloaded again after virtual network peering has been successfully configured.

Error: 'The revocation function was unable to check revocation because the revocation server was offline.(Error 0x80092013)'

Causes

Download Failed Because Resources Could Not Be Found Lyrics

This error message occurs if the client cannot access http://crl3.digicert.com/ssca-sha2-g1.crl and http://crl4.digicert.com/ssca-sha2-g1.crl. The revocation check requires access to these two sites. This problem typically happens on the client that has proxy server configured. In some environments, if the requests are not going through the proxy server, it will be denied at the Edge Firewall.

Solution

Check the proxy server settings, make sure that the client can access http://crl3.digicert.com/ssca-sha2-g1.crl and http://crl4.digicert.com/ssca-sha2-g1.crl.

VPN Client Error: The connection was prevented because of a policy configured on your RAS/VPN server. (Error 812)

Cause

This error occurs if the RADIUS server that you used for authenticating VPN client has incorrect settings, or Azure Gateway can't reach the Radius server.

Solution

Make sure that RADIUS server is configured correctly. For More information, see Integrate RADIUS authentication with Azure Multi-Factor Authentication Server.

'Error 405' when you download root certificate from VPN Gateway

Cause

Root certificate had not been installed. The root certificate is installed in the client's Trusted certificates store.

VPN Client Error: The remote connection was not made because the attempted VPN tunnels failed. (Error 800)

Cause

The NIC driver is outdated.

Solution

Update the NIC driver:

1. Click Start, type Device Manager, and select it from the list of results. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
2. In the Network adapters categories, find the NIC that you want to update.
3. Double-click the device name, select Update driver, select Search automatically for updated driver software.
4. If Windows doesn't find a new driver, you can try looking for one on the device manufacturer's website and follow their instructions.
5. Restart the computer and try the connection again.

Error: 'File download error Target URI is not specified'

Cause

This is caused by an incorrect gateway type is configured.

Download Failed Because The Resources Could Not Be Found Gta San Andreas

Solution

The Azure VPN gateway type must be VPN and the VPN type must be RouteBased.

VPN package installer doesn’t complete

Cause

Download Failed Because The Resources Could Not Be Found Ne Demek

This problem can be caused by the previous VPN client installations.

Solution

Resource Group Cannot Be Found

Delete the old VPN client configuration files from C:UsersUserNameAppDataRoamingMicrosoftNetworkConnections<VirtualNetworkId> and run the VPN client installer again.

The VPN client hibernates or sleep after some time

Solution

Check the sleep and hibernate settings in the computer that the VPN client is running on.