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I observe the same behaviour with Firefox 4.0.1 as described in Cannot login with Opera: Page Not Found. I use the same procedure and observe the same outcome. It neither works with Firefox started in SafeMode with all add-ons deactivated.

Internet Explorer 9 is OK.

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You're exhibiting this error. The first person I've actually got "on the line" who has encountered it.

I'm going to go out on a limb and say this is your ISP doing something very... internet-breaky. IE 9 working (I'm guessing intermittently) is odd, but I can imagine bogus caching rules that would allow it.

Anyway, from your IP address I've logged the following:

Cache-Control: no-cache 
Accept: text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/webp, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1 
Accept-Encoding: gzip, deflate 
Accept-Language: de-DE,de;q=0.9,en;q=0.8 
Cookie: canary=1; anon=[REDACTED]
User-Agent: Opera/9.80 (Windows NT 6.1; U; de) Presto/2.8.131 Version/11.11 


Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 
Accept-Encoding: gzip, deflate 
Accept-Language: de-de,de;q=0.8,en;q=0.6,en-us;q=0.4,es;q=0.2 
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 
DNT: 1

Both as GETs to /affiliate/form/login/submit, which expects POSTs. This is very very wrong. Could you do a traffic capture* to see if this is your browser (for some crazy reason) submitting GETs instead of POSTs, or whether it's a proxy/ISP doing the conversion down the line?

Confirmed: These requests are arriving at our network as GETs, but leaving the browser as POST. Tricky...

Also note, that FireFox's "Do Not Track" behavior (what with not accepting cookies, and that DNT header) will break this as well. The GET instead of POST is just the first thing that explodes.

*Firebug (or the Opera equivalent, if there is one) would be best, HTTPS makes proper capture a bit of a pain.

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see his comment to my answer. Frank says there is a POST request from Firebug, that implies it's something modifying it "above" the browser. – Jeff Atwood Jun 5 '11 at 19:20
@Jeff - ah, missed the comment. Fun. Digging into logs, but every other time I've looked at this its been arriving at our network as a GET. – Kevin Montrose Jun 5 '11 at 19:39

When we see this, it is usually because the browser is misconfigured or has rogue plug-ins.

Try it in Firefox Safe Mode -- hold down shift while starting the browser:

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Funnily, I have no trouble logging-in and -out with Opera 10. Firefox does neither work with all add-ons deactivated. For further testing I created a new Firefox profile. This profile works as long as I restart Firefox. Then I also can no longer log-in with that empty profile. Clearing the cache does also not seem to work. Perhaps this is a Firefox bug. – Frank Schwarz Jun 5 '11 at 17:31
According to Firebug there is a post request to which is responded to with 404 Not Found. – Frank Schwarz Jun 5 '11 at 17:40

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