XF 1.4 Wrong password with subdomain

That shouldn't happen assuming both URLs point to the same installation of XF. Either the password is being mistyped or the two URLs are different forums. I suggest you ask him for his password so you can try to reproduce the problem. Or you can reset his password through the Admin CP.

It is a good idea to enforce just one URL for your forum.
 
Only other possibility is if you have different PHP configurations between them, notably one running PHP 5.2 and the other running a later version. You need to run using PHP 5.3+ if you ran PHP 5.3 in the past.
 
Only other possibility is if you have different PHP configurations between them, notably one running PHP 5.2 and the other running a later version. You need to run using PHP 5.3+ if you ran PHP 5.3 in the past.
He updated to php5.4 and it now works (y)
 
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