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Microsoft Outlook is a popular email client application used by millions of users around the world. But sometimes, things do not go well with Outlook. Whenever something goes wrong, you receive an error. There are many error messages that appear from time to time if there is any problem in the Outlook client. In this article, we will discuss the Outlook 8 error code and resolve it with common reasons. behind.

Outlook is unable to connect to the proxy server

Suppose you open Microsoft Outlook on your system. But the Outlook client fails to open. Instead, you receive an error message saying, “Outlook can not connect to the proxy server.”

When Outlook attempts to connect to the server by using a remote procedure call (RPC) connection or a secure HTTP connection (HTTPS), you may receive the error message above. You need to ask yourself the reasons that are highly responsible for this Outlook error message. If you have no idea, let me help you with that.

Most Common Reasons

Below you will find the list of highly responsible reasons for the problem:

• If the connection to the server requires a certificate authority, you may receive this error message.
• You did not trust the CA at the root.
• The certificate may be invalid or revoked.
• The certificate does not match the name of the site.

How to Troubleshoot Outlook error code 8?

There are some easy methods which you can use for troubleshooting the Outlook error code 8.

Method 1: Check the Certificate

Before you can try anything, you must review the certificate. Follow these simple steps to do it:

1. Start by launching Internet Explorer on the computer. Then, connect to the RPC server or any other secure server by typing https://www.server_name.com/rpc in the address bar. Press Enter.
2. You can see a padlock icon in the lower right corner of the browser. Double click on it.
3. Now click the Details tab. Here you have to check the information in these two fields:

Valid for: In this field, you will see the date until which the certificate will be valid.

Subject: Ensure that the entry in this field must match the name of the site.

Method 2: Install Trusted Root Certificate

If the above method fails or does not work, you must try to fix error code 8 in Outlook by installing the trusted root certificate. Follow these simple steps to do it:

1. In the Certificate dialog box, click Install Certificate. Then click the Next button to continue the process.
2. Now, select the Place all certificate in the following store check box. Click the Browse button.
3. Click Trusted Root Certification Authorities, and then click OK. Now, click the Next button to continue the process.
4. Finally, click Finish and OK.

Method 3: Remove 3rd Party Add-ins

If you tried both of the above methods while receiving error code 8 in Outlook, the error may be associated with third-party add-ins. It is therefore best to start the Outlook client in safe mode. Click Start> Run, type outlook.exe / safe and press Enter. If the Outlook client starts in safe mode without problems, the real culprit is one of the third-party add-ins that you use. If there are too many supplements, it is always difficult to find the one that is defective. So, before you can delete, try to disable them one by one. This process may take a while, but you will find the bad add-in that you need to remove from the Outlook client.