Citrix Farm oddness.

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Recently ran into this one so posting this here for those Citrix Farm admins...

We have two farms, an XPe (I know!) and a PS4 (yes I know already!!) which both work fine.  Clients use PNA v8 (!!) to connect and the web application allows both farms to be shown.  Cool.

Some XP clients (and again I know!) stopped working on the XPe farm ONLY.  All application from he PS4 farm were fine.  After following procedure we found that this occured directly after a patching weekend.  Bingo.  Seems SP3 and some other patches (we didn't look to hard after we found the solution) change the permissions on a registry key.  Oh thanks.  This stops Citrix client 8 from connecting to the XPe farms.  Odd but true.  We changed the permissions back to allow the users access and things returned to live.  We did this using GPO but I guess manual would work too.

HKLM\SOFTWARE\Microsoft\MSLicensing

We gave everyone full control, however use your security policy to determine this!

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