After the certificate of a Citrix XenApp server was updated, some Windows XP SP3 (*sigh*) clients can't access the published applications anymore.
The Citrix web page is shown, the certifactes are in place and look fine (trusted).
When opening a published app, SSL error 14 is displayed after a few seconds by the Citrix receiver plugin, http://support.citrix.com/article/CTX113309
says: can't work to the cipher strength required
Update to latest Citrix Receiver (4.2) did not help.
How can I find out which cipher is requested? How can I enable it on XP?