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callout error PKIX path building failed:


Today a call out to web service started to fail in sandbox, it return me this error 'PKIX path building failed:' and this server has 'thawte SSL CA - G2' certificate'. Right now we don't have any problem in production. It is working. Could be any relation between SSL 3.0 disable and this error? 

Best Answer chosen by TixoGroupalia
ShashankShashank (Salesforce Developers) 
Here is the list of valid certificates:

I don't see your certificate on the present list. It is probably taken off the list, in case it was previously there, because SSL3.0 has been disabled now.