Symptoms
After upgrading to the latest version, application is unable to connect to server with error :
“The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.”
Cause
It is possible the certificate in IIS has changed or expired.
Resolution
You may check the certificate status by accessing the affected site through a browser and clicking the lock:
The expiration date is here:
Please make sure that it is valid.
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