Sorry to resurrect this but I believe I'm experiencing the same issue. I've tried everything under the sun from dscheck, flush the lhc, re-register xml, assign default load evaluators, add remote desktop users group to access server from the network and add UseNetworkLogon to 1. We have 2 farms PS4 and 4.5 and using WI farm aggregation to merge the application set. I'm seeing this error only from the 4.5 farm. Per CTX118905 I'm reading it as a mixed 4.0\4.5 farm however our farm isn't mixed and the 4.0 and 4.5 farms are independent... Can anyone confirm that when the 4.0 farm is gone so are the errors? Thanks, Brandon Mitchell From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of GTaylor@xxxxxxxx Sent: Monday, January 05, 2009 3:02 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Web Interface Event Log Shows an Error of Type IMA with an Error ID of 0x80000001 Reported by the XML Service Yes, I brought it up on the list last week and also spent a day on the phone with Tech Support. We tried a lot of things with IMA and the XML brokers, then got the new KB article explaining it. Now the solution for me is to get rid of the 4.0 farm, in the plans anyways. George From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Carl Stalhood Sent: Monday, January 05, 2009 12:03 PM To: thin@xxxxxxxxxxxxx Subject: [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 ________________________________ Regional Health's mission is to provide and support health care excellence in partnership with the communities we serve. Note: The information contained in this message, including any attachments, may be privileged, confidential, or protected from disclosure under state or federal laws . If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the Sender immediately by a "reply to sender only" message and destroy all electronic or paper copies of the communication, including any attachments. ________________________________ This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is confidential and protected by law from unauthorized disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.