Can you try the following:
-if using chrome open an incognitio window they try to login.
-Close all browser windows and clear your cookies, or search through the cookies cached on your browser and remove the cookie assocaited with the IP of your expedition server. Try the login after removing the cookie for the expedition server,
I suspect the php session ID is not being handled properly or being timed out correctly which may be causing your login to hang.
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