Hello there,
This might be due to the SMB.
SMB is a network file sharing protocol that requires an open port on a computer or server to communicate with other systems. SMB ports are generally port numbers 139 and 445.
Port 445 is used by newer versions of SMB (after Windows 2000) on top of a TCP stack, allowing SMBs to communicate over the Internet. This also means you can use IP addresses in order to use SMBs like file sharing.
Some antivirus and firewall software will interact with the VPN connection. You might need to turn off SSL (port 443) monitoring.
Hope this resolves your Query !!
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