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Has anybody encountered the situation when the same user from the same session ID and the same browser requested 2 different scripts on the same webserver inside the duration of 30 sec from two different IP addresses thorugh HTTPS?

Is it viable/normal situation?

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up vote 11 down vote accepted

Yes, it's normal. ISPs, particularly AOL and mobile providers, can route traffic through different proxies which will change the IP address of a user as they surf the web. Users using a proxy server can also experience this. This is why depending on a static IP address from a user during a session is not recommended for any kind of identification system on a website.

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+1 @John Conde, thanks. I just want to make sure if your answer covers HTTPS and not HTTP only? – Gennady Vanin Геннадий Ванин Feb 11 '11 at 13:25
https only encrypts the connection. It doesn't affect the IP address. – John Conde Feb 11 '11 at 14:03

There may also be a case of session hijacking in which case the users session is hijacked by a cracker and used to access the legitimate user's account. In this case we may find the user to be "virtually" accessing the web content from two different IPs.

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