EAS Proxy Server

Hi all, I have a problem with EAS Proxy.

 

I configure once on Azure and i set the Instance SSL (bind port 55443) to comunicate with gsuite mail.

When i try to connect i receive the error in the log as attachedEASProxy.log

 

The error row said: "ERROR OutboundHandler_EAS_Google - Exception on channel -958041404 remoteAddr: null localAddr: 0.0.0.0/0.0.0.0:49844: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"

 

All traffic is open from outside to the port 55443 of the Public ip of the VM

Could you help me?

Nicola