URL monitor 6.1 SSL handshake failed error in Dynatrace 6.1 - dynatrace

URL monitor 6.1 was working fine till date but today I'm getting following exception:
SSL handshake failed, this may be caused by an incorrect certificate. Check 'Disable certificate validation' to override this. Exception message: peer not authenticated
Even I checked the Disable Certification validation check-box but issue doesn't get resolved.
I do have Dynatrace Client 6.1. Please suggest where should I check now.
Thanks

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Details:
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