The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel
I am facing the above error in MABS (Microsoft Azure BizTalk Services).
Any particular solution for this?
According to my knowledge it may be either a certificate error or an database access error. I am getting this while deploying where as building is successful.
It's very likely your ACS namespace, issuer, or access key is incorrect. Building wouldn't give you this error, as building is only done in the local environment. Deploying actually makes a secure connection with MABS so upload your assemblies.
Another option to check would be to make sure that your current firewall rules allow for the proper connections.