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Callout Exception: Unrecognized SSL message, plaintext connection?

I am calling a external web service using http callouts but getting a error Callout Exception: Unrecognized SSL message. 

Best Answer chosen by Admin (Salesforce Developers) 

It could well be that certificate on the server is not recognising salesforce.If that is the  casse then you may have to upgrade certificates on the server to ensure that it accepts request from salesforce.