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Upon entering a username and password (whether it is valid or not) and clicking Login, I frequently get a popup with this message:
An AJAX HTTP request terminated abnormally.
Debugging information follows.
At first, I thought it had to do with the secure login module. But then it reappeared later while the module was still disabled. This problem may still have something to do with SSL, however. I need to test longer.
Later, I thought it was happening when the user is already logged in. From my experience, when opening a fresh browser window, if you go to the home page and you are already logged in, it will not appear as such until you actually go to /user, at which point it will just show you logged in and after that the admin menu shows up, etc. So if I have a cookie that is authenticated, it's like it is not reading it until I hit /user first. Thus the login doesn't work and produces the above AJAX error, probably because a login is not really required. It seemed like this was the case, but then after awhile I got the error again when I was not logged in.