I am having the same problem. When I click Remote Assistance and Allow Remote Control I get the following error message:

Connecting to host: rh.ara.avast.com
A local error occurred: Unable to connect to the Remote Assistance server!
Session has terminated with an error.

Has the Avast Remote Assistance server been down the past few days? We are using Avast Endpoint Protection on our clients in Small Office Administration (SOA) mode.

Thanks