We are using MDM (Mobile device Management) solution (SaaS), which enables ActiveSync on users mailbox when user provision devices in MDM. The process had been working until last week. Now MDM solution console is generating below error message and PowerShell is not executed for any new devices provisioned in MDM:
Exception Message: Connecting to remote server failed with the following error message : The server certificate on the destination computer (XXX.test.com:443) has the following errors: The SSL certificate could not be checked for revocation. The server used to check for revocation might be unreachable.
There was recently a change implemented on Exchange/CAS server. The IIS for client certificates was set to "Ignore" in SSL Settings for ActiveSync folder. This was implemented because existing ActiveSync users were getting 403 certificate error on devices. Implementing the change resolved the connectivity issue for existing MDM provisioned devices
Not sure if the above changes has impacted executing powershell. But the error is now generated for executing PowerShell for new devices enrolling in MDM solution.
This can be caused by failure to connect to the certificate revocation list. Here are a couple of causes and options: http://exchangeserverpro.com/exchange-2010-certificate-revocation-checks-and-proxy-settings/
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