Aborted connection

I keep getting the below notification on Avast Business :

Threat blocked : We’ve safely aborted connection on because it was infected with SMB:CVE-2017-0144 [Expl].

Any idea what could the cause be and how to fix.

Avast installed on a Windows Server 2008 R2 SP1.

Running a Full/Boot scan doesn’t pick up anything and system is up to date on Windows.

Hi, see: https://forum.avast.com/index.php?topic=208445.msg1419511#msg1419511