Its a registry change rather than a patch .....
If you have a 'current' SME build - I think 6.0 up, (but this may work on 5.6 or even 5.5) just browse to
http://your-sme-server/server-resources/regedit/and then right-click / saveas on the winxplogon.reg file. (In IE you may even be able to just open it direct from the webpage) save it to the desktop and then double-click it, you do want to merge it into the registry.
Once its in you can join the domain. It makes one tiny registry tweak that MS tightened in XP. The file contains the following entries:
REGEDIT 4
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\netlogon\parameters]
"RequireSignOrSeal"=dword:00000000
I don't remember (because I did it about 2 years ago) but you may have to reboot the XP machine to have the change take effect.
The
http://your-sme-server/server-resources/regedit/ address is not accessible from the internet side so this needs to be done via the LAN, or download the file and email it / take it on a disk / write it down(!)
HTH
David.
Just noticed, Happy 1st Anniversary as a Forum Member to Me!
