What to Do If Outlook is Unable to Connect to The Proxy Server ?

Published By Jamie Kaler

Approved By Rollins Duke

Published On July 17th, 2023

Reading Time 3 Minutes Reading

Working with Outlook is not always easy. Sometimes, users experience problems while they work, which ultimately leads to the appearance of errors (Outlook is unable to connect to the Proxy Server). In this blog, we will analyze the problem when Outlook can not connect to the proxy server.

Error Messages Generated

At times, when Outlook connected to a server via RPC (Remote Procedure Call) connection or an HTTP connection, the following error messages may get generated:

1. There is a problem with the proxy server security certificate. Outlook can not connect to this server.
2.  The name in the security certificate is not valid or does not match the name of the site. Outlook can not connect to this server.

   

3. There is a problem with the proxy server’s security certificate that if it is not from a trusted certifying authority, Outlook is not able to connect to the proxy server.
   

The Reason Behind The Errors

There are many reasons associated with the occurrence of the errors mentioned above. Errors can occur in case any of the following conditions are there:

1. Certification Authority (CA) required to connect to the server.
2. The certification authority has not trusted the root.
3. There are chances that the certificate gets revoked or stands invalid.
4. The certificate does not match the name of the site to which the connection is made.
5. A third-par browser or add-in is preventing access to the particular website.

Resolution to Overcome the Error

1. Examining the Certificate
   In case you experience error 1 or 2, examine the certificate thoroughly. Two things that are must check in the certificate. First, the expiry date of the certificate and, secondly, the information mentioned in the Subject field must match the name of the site. Follow the steps below to examine the certificate:
   • In the Address Bar of Internet Explorer, type https://www.[server_name].com/rpc and press Enter and connect to the RPC server.
   • In the lower-right corner of the browser, double click and select the padlock icon.
   • Select the Details
   • In the dialog box, check the validation date of the certificate and the subject. In case the certificate has expired, contact your administrator. Also, the presented subject does not coincide, make the necessary changes.

2. Installation Of Trusted Root Certificate
   

   Follow the below-mentioned method in case you receive Error 3:

   • In the Certificate dialog box, click on Install Certificate
   • Click
   • Check the Place all certificate in the following store
   • Select Browse.
   • Select the Trusted Root Certification Authorities option and click on Ok.
   • Click Next and then Finish to end the process.

3. Disable Third-Party Browser& Add-in
   

   The errors get removed, by disabling the third party browsers and add-in.

   • Click on Start and then select the Run
   • In the box, type exe/safe. Then, select Ok. This will start Outlook in safe mode.
   • In case, Outlook starts in Safe mode. Then, surely the issue caused by the third-party add-ins. And, the only solution is to disable them.

   For disabling the third-party add-in, follow the below mentioned steps:

   • Open Outlook and select the File
   • Click the Options. Then, select the Add-Ins option from the left-side menu.
   • In the Add-Ins section, select and remove the add-in that you desire to disable.
   • Exit and then restart Outlook.

Conclusion

The outlook email application is used by millions of users daily. But sometimes, while working on it is quite challenging. We believe that with the help of the methods mentioned above, users can easily fix the error. Also, the user can reconnect Outlook to the proxy server.