if(username ne '$uname' && password ne '$pword')

Single-quotes do not interpolate, so the string  '$uname' above is literally  'dollar-u-n-a-m-e' and not whatever the  $uname lexical holds. Likewise  '$pword'.

The other thing I wonder about is just what  username and  password are? Function calls? Metasyntactic variables? It's always best to post actual code, especially when you say "this does not work".