When trying to migrate a VMM from one server to another in the Virtual Machine Manager it fasils with error code 2940.

 "VMM is unable to complete the requested file transker. The connection to the HTTP server server.domain.local could not be established"

Only migrating VMMs on one of the HyperV nodes would result in ths error. I had no problems migrating VMMs on the other HyperV nodes.

Solution:

The solution for me was to restart the Bits service on the HyperV node that had the problem. After the restart of the Bits Service I could migrate the VM without any errors.