Port 2821 Low level encryption

I'm getting a positive hit on a retina scan for low level encryption (Audit ID:
12237). The scan states that it is set to 56 bit. I need to change to
128-bit to comply.

It is getting the hit on port 2821 and the service on the port is
vrts-at-port. This is on the server that I am getting the hit.

Any idea as to how I can change this or why I should not change?

Everything I am finding is pointing me to the client application.