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We have a LAN which shares a common WAN IP address. My friend logged in into StackOverflow with his login from his PC. He sent a link of a question to me to check it. I opened it in incognito window of Google chrome and I found to be automatically logged in into StackOverflow with my friends account in my PC. Is that caused because of the common WAN IP address for the entire LAN? If so it's a big issue. Any of my friend can get logged in into my account automatically if he is in this LAN and I sent a question link to him.

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closed as too localized by Time Traveling Bobby, hims056, Bo Persson, kiamlaluno, BinaryMisfit Feb 13 '13 at 12:43

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

"I feel it to be a security hole." Sure looks like it. But it's a security hole in your network infrastructure, not in our site. – balpha Feb 13 '13 at 11:26
@balpha : i checked with other websites, why dont they show this issue, why this "your so called site" only show this ? please answer me – prashu132 Feb 13 '13 at 11:29
@prashu132: We cannot see your network setup. What we can see is that ip addresses do not factor into authentication. If it did, I'd be constantly disconnected as I travel. – Martijn Pieters Feb 13 '13 at 11:36
Am I you guy's enemy? Giving these much negative voting makes feel like that. I am not complaining to you, i'm just informing you that such an issue happened. Who knows whether its really your side issue or not. StackOverflow makers are not the supreme developers of the world so that they wont make mistakes. – prashu132 Feb 13 '13 at 11:48 Relax. We know you're informing us of an issue. We're telling you that we can't determine anything on our side to be the cause of your issue. – BoltClock's a Unicorn Feb 13 '13 at 11:56
Down votes on support requests usually seem quite silly to me too, but don't take them personally. – Tim Post Feb 13 '13 at 12:03
I have to agree with @TimPost here; I guess the down votes mean, "Your report does not make sense to me and I think your conclusion is wrong", but I don't see a reason from the question itself to down vote. (my opinion!) that said, some of the subsequent comments might have earned a couple of the down votes. (understanding, as I do, that some of the DV's possibly came before the comments) – Andrew Barber Feb 13 '13 at 14:03

No, that's not possible. Your IP address is never taken into account for authentication, let alone the only thing to authenticate you.

What is possible is that your WAN uses a faulty proxy to cache Stack Overflow responses.

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not sure about that, i'm not a network guy so donno much about proxies its managed by seperate team and i dont have access to that – prashu132 Feb 13 '13 at 11:23
So, check with the system administrator. – Toon Krijthe Feb 13 '13 at 11:25
@prashu132: If this is the case you may see the same effect on other sites that require authentication maybe - try looking for those. – Jon Egerton Feb 13 '13 at 11:25
i didnt have problem with other sites, i checked it first as soon as this issue occured. – prashu132 Feb 13 '13 at 11:26

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