The remote process took longer than the allowed time to complete and was aborted.
Most likely the time allotted to complete the process is too short. Depending on the operation being performed, it could be that the operation has locked up and it may represent a bug. If this occurs during a deployment with PDQ Deploy then it can be that the application being deployed is not being run in silently, i.e. it's waiting for user input which will never come.
Raise the timeout in Preferences for the operation (Scanning for Inventory or Deployments for Deploy). If deploying an application with PDQ Deploy, ensure that the proper silent parameters have been entered.
If the problem persists, there may be an issue with the remote process which may entail sub additional troubleshooting, in which case contact email@example.com.