Knowledge Base

Problem

You may receive this error:

“You are using an invalid client certificate or an invalid server certificate” 

Cause

1. You encountered a TCP connection problem. 
2. The client computer is sending a lot of data. 
3. A time-out setting on the server or on another network device is set too low. 
4. You are experiencing an HTTPS protocol compatibility problem.
5. You are using a self-signed certificate.

Resolution

Please verify the following criteria:

• Please ensure you are using the most recent version of the .NET Framework
• Disable the keep-alive feature. To do so, In the .NET Framework, set the HttpWebRequest.KeepAlive property to FALSE
• Set the ServicePointManager.MaxServicePointIdleTime property to less than the time-out value of the server keep-alive connection
• Increase the time-out value on the server computer and on other network devices
• Make sure that the client computer does not send the HTTP 100-Continue header. On top of that, ensure the client computer does not expect to receive the HTTP 100-Continue header.
• If you are using a self-signed certificate enroll one from a trusted certificate authority.

For further information regarding this problem and other possible solutions, go and look at Microsoft Article 915599