What is Outlook certificate error
When outlook tries to connect a server by using a remote procedure call connection or a secure HTTP connection, you get one of the below written message:
Error Message Show on Your Email
- Error message 1: There is a problem with the proxy server’s security certificate; %s. The Outlook is unable to connect to this server. Outlook error 421 cannot connect to smt is also a similar technical problem.
- Error message 2: There is a problem with the proxy server’s security certificate, %s. The name on the security certificate is invalid or is not matching with the name of the site. The Outlook is unable to connect to this server. (%s)
- Error message 3: There is a problem with the proxy server‘s security certificate, %s. The security certificate is not from a trusted certifying authority. The Outlook is unable to connect to do this server. (%s)
- Error message 4: There is a problem with the proxy server’s security certificate. The name on the security certificate is invalid or does not match with the name of the target site. The Outlook is unable to connect proxy server.
This technical issue can occur if one or more of the following conditions are true
The connection to the server requires a certification authority. You might not trust the certification authority at the root. The certificate may be invalid or revoked. The certificate might not be matched with the name of the website. A third party add-in or a third party browser add-in is blocking access. Outlook connect error 10060 is also a similar type of problem.
For resolving this issue, use one of the following issues as appropriate for your situation
Procedure 1: Examine the certificate
You can use this procedure if you get either error message 1 or error message 2. Check the certificate. Then, connect with your system administrator for resolving the technical issue.
For checking the certificate, follow these steps
- In Microsoft internet explorer, connect to the RPC server or to the secure server.
- Double click on the padlock icon which is located in the lower right corner of the web browser.
- Click on the details tab.
- Fill the information in the following fields
- Valid to field shows the date for which the certificate is valid.
- Subject field should be same as the website name.
Procedure2. Trusted root certificate should be installed. Use this procedure if you get error message 3. Follow the steps written below for installing the root certificate.
- Click on Install certificate and then click on
- Click to select place all certificates in the following store check box.
- Click Browse and click on trusted root certification authorities and then click
- Click Next and then click on
- Click OK.
Procedure3. Disable the third party add in and the third party browser add in.
Perform this procedure for disabling the third party add in or third party browser add in if you get error message 4.
Disable third party add-ins
- Start your Outlook in safe mode for resolving the technical issue. For doing this, click on start and then click on Run, write outlook.exe/safe and then click OK.
- Check for third party COM add-ins and disable them. Follow these steps:
- Click on Options in the File menu and then click on Add-ins.
- Click on COM add-ins and then click on manage. After this, click on Go.
- Click to clear the check box next to the third party add-ins which you want to disable.
- Restart your Outlook.
If you are still not able to resolve the technical problem, then you can call on outlook technical support phone number and get online help for solving the technical problem in a simple and quick way.