we've run an Citrix Farm with 4 x Windows 2008 x64 (XenApp 5.0 FP3) and one server Win 2003 x86 (Xenapp 4.6). Yesterday we had a strange problem with Session logins. Existing Sessions could work without problems but new logins were not possible. In the AMC we could not see the Sessions on the Servers. After an reboot all worked fine again. We run the 32 Bit Server since 3 days in our farm (for one Application). Could it be possible that this behavior is caused of the mixed farm?
-- (we got in this time a lot of wmi warnings that the Provider CitrixEvemtProv has been registered but it does not correctly impersonate user requests.