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Madhav GoyalMadhav Goyal 

System.CalloutException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Hi There,

I am working on an Integration, while making a callout I am getting the below exception: 
System.CalloutException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Can you please help me out why am I receiving this error and how can this be fixed?

Thanks in Advance.