Two suggestions; try them in order and then try them both together:
  1. Do a GET request of this same form before you do a POST. It may be that the GET request sets some required cookies. (such as a session ID)
  2. In the POST, include also the value for the submit button (Fortsätt). I find this unlikely to be the cause, but you never know in what screwy manner these people wrote their php
Actually, the more I think about it, the more I think that (1) is pretty likely the answer. Turning on cookies and then making only one HTTP request is pretty pointless - the other side will see exactly the same traffic from you as if you hadn't enabled cookies. However, if you turn on cookies and then make two requests to the same server, the second request will look different (assuming that the server set a cookie in the first response)

If you're still having problems, one other thing I'd check is that internet explorer is able to process this form after having had all cookies from swipnet.se wiped out and having been started directly at the login page (so that it didn't start somewhere else and get a swipnet session cookie that way).

If it turns out that internet explorer also needs to, say, visit the top page of http://login1.swipnet.se/ and be redirected in order for the login.php form to work, then I'd just replicate the series of pages that explorer visits with a bunch of GET calls to set the appropriate cookies.

In reply to Re: LWP HTTPS POST returns 500 EOF by fizbin
in thread LWP HTTPS POST returns 500 EOF by epljsod

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