Security exception connecting to mail server

Hi there,

 

After upgrading Appian 7.9 (Websphere Application Server) to Appian 18.4 (Tomcat Application Server) we are unable to configure appian to poll emails to Trigger a process when an email is received.

We always see the security error: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

 

We have imported the certificate in the Appian Admin console with no luck. The same certificate is used for other Services with no Problem. In this case do we Need the Import the certificate in the tomcat keystore as well? or somewhere else?

 

Many thanks!

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