[THIN] Web Interface Event Log Shows an Error of Type IMA with an Error ID of 0x80000001 Reported by the XML Service

I think somebody reported this issue last week. A new KB article was posted.

 

This problem occurs in a mixed farm environment of Presentation Server 4.5 and Presentation Server 4.0, where the XML broker is the Presentation Server 4.5 server. In Presentation Server 4.5, ccticket can talk to IMA using RPC or XML. In Presentation Server 4.0, this communication is XML only. The LaunchReference string fails because this API does not exist in Presentation Server 4.0. When the RPC request fails, the Presentation Server 4.5 ccticket falls back to the XML request, which is by design. The Web Interface generates an event log error as a result of the fallback from RPC to XML.

 

http://support.citrix.com/article/CTX118905