After upgrading from 7.5 to 8.1, a task server no longer registers to itself or allows clients to connect.
Error code: HTTP status 401: The request requires user authentication (0x8FA10191)
Error note: Authentication: Failed. Server refused to authenticate with provided credentials.
Site server is not part of domain.
Further details from the 8.1 SMP Release Notes in the known issues for Task Servers section: "In ITMS (IT Management Suite) 8.1, Anonymous Authentication is disabled for the ClientTaskServer website. That may lead to situation where client computer is not able to access Task Server. For example, if Notification Server and Task Server are in domain and configured under the domain user and the client computer is not in domain. You may need to set up the Agent Connectivity Credentials to let the client computers access the ClientTaskServer website."
Workaround: Enable Anonymous Authentication to the ClientTaskServer virtual folder.
A fix is available in 8.1 RU4 version. To upgrade refer to http://www.symantec.com/docs/DOC10690
The use of ACC (Altiris Connectivity Credentials) can avoid the need of Anonymous Authentication that previously was needed, as well to avoid entries like "The remote server returned an error: (401) Unauthorized":
You have to add a "NOT" domain user as ACC account on the following places: