WordPress MU

I upgrade from wpmu 2.6.5 to 2.7 using the codex instructions. Bt after upgrade my blogs are running fine but i can't log-in to my admin panel. After trying fora while i press forget password there when i give the user name it does not any confirmation massage bt when i put the email then send the confirmation link. Bt when i click on the link it shows some internal server error.

Can some please suggest me any solution immediately? otherwise i have restore the old files.

Did you add in the new lines from the wp-config-sample.php file?

sorry as this topic is posted three time... this issue is solved in http://mu.wordpress.org/forums/topic.php?id=11042