Slack connection failed with no reason. Error: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

@syamimi.adenan

This is due to a security certificate issue you have to add the certificate to the slack Url you are using a

  1. download the certificate from the Slack and follow my workaround here

in the below thread i added it for remote but u can use the same to download the certificate from slack