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ZathZath 

SSL problem - URGENT

A remote site of ours had a SSL issue that was resolved.  But now, callouts from salesforce to this site are failing from prodcution.  Now problem with sandbox, or by access the endpoint URL manually.

The error received is: : java.security.cert.CertificateException: No subject alternative DNS name matching optoexpert.com found. 

Does salesforce cache SSL certificates?  and for how long?
ShashankShashank (Salesforce Developers) 
Please see if this helps: http://salesforce.stackexchange.com/questions/34904/salesforce-certificate-exception-no-subject-alternative-dns-name-matching-found