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    • CommentRowNumber1.
    • CommentAuthorMike Shulman
    • CommentTimeNov 16th 2009

    Occasionally (randomly?) when I try to post a comment on the forum, I get the following error:

    Some problems were encountered
    There was a problem authenticating your post information.
    

    I then click on "Post comment" once more and it goes through fine.

    • CommentRowNumber2.
    • CommentAuthorAndrew Stacey
    • CommentTimeNov 16th 2009

    I've had that once or twice as well. I've only the vaguest idea of how to track it down!

    It's entirely possible that it's due to two people trying to post "simultaneously" which explains why it goes away again straight after.

    I'll try a search through the docs to see if there's an explanation. In the meantime - for anyone else's information - if this does occur then, as Mike says, clicking "Post comment" once more has always fixed it so far.

    • CommentRowNumber3.
    • CommentAuthorTobyBartels
    • CommentTimeNov 17th 2009

    I've seen it too. Should we keep track of these for reports to you?

    • CommentRowNumber4.
    • CommentAuthorAndrew Stacey
    • CommentTimeNov 17th 2009

    Hmm, looking through the code shows that this happens when a certain key embedded in the form doesn't match the one set by the session cookie. It's possible that this is something that can happen if one gets changed without the other (there's some comment on this in the code, but the relevant bit seems to have been commented out).

    I have a suspicion that this might be if you submit two comments from two windows in your browser in quick succession. Does that sound right? How often have you two seen it (I think I've only seen it once or twice)?

    I'm reluctant to try to fix this one as it seems to be something quite deep involving authenticating the user and checking that they haven't been hijacked. On a scale of 1 to 10, how annoying is it?

    • CommentRowNumber5.
    • CommentAuthorMike Shulman
    • CommentTimeNov 17th 2009

    I've seen it maybe half a dozen times. I never noticed a pattern like submitting comments in quick succession, but it could very well be; I'll pay more attention. Given that it always works to just click "submit" again, I'd only rate it a 1 or 2 on a scale of annoying.

    • CommentRowNumber6.
    • CommentAuthorMike Shulman
    • CommentTimeNov 17th 2009

    I just got this error again, not having submitted any other comments recently.

    • CommentRowNumber7.
    • CommentAuthorAndrew Stacey
    • CommentTimeNov 17th 2009

    It may be less the number of comments that you've submitted and more the number of windows that you have open to the forum. Do you tend to have it open in a couple of tabs or just one?

    • CommentRowNumber8.
    • CommentAuthorEric
    • CommentTimeNov 17th 2009

    I second the guess it is simultaneous postings.

    • CommentRowNumber9.
    • CommentAuthorTobyBartels
    • CommentTimeNov 17th 2009
    • (edited Nov 17th 2009)

    Ditto Mike's comment #5

    And yeah, I usually have the forum open in several tabs at once, at least when I come back to it after a break of several hours.

    • CommentRowNumber10.
    • CommentAuthorAndrew Stacey
    • CommentTimeNov 17th 2009

    The break may be significant. Session cookies can sometimes simply expire of their own accord.

    • CommentRowNumber11.
    • CommentAuthorTobyBartels
    • CommentTimeNov 17th 2009

    No, I mean that if I wake up, turn on my computer, start Firefox, and go to the Forum, then there are often several unread comments, which I will open all at once into several tabs.

    I don't mean that this authentication problem occurs when I leave the browser open for several hours.

    • CommentRowNumber12.
    • CommentAuthorAndrew Stacey
    • CommentTimeNov 17th 2009

    Ah, that could be it. If you load all effectively simultaneously then there is a potential for confusion about session cookies. When you make the requests, each thinks it is the first request so sets a session cookie, but only the last one survives (each overwrites the previous). However, a certain variable gets embedded in the session cookie which is also embedded in the forms. So only one of the forms will match the session cookie.

    Here's the experiment: open several discussions and try to do it fast enough that they load effectively simultaneously. Then try submitting a comment on the first one to load and see if that produces the error.

    • CommentRowNumber13.
    • CommentAuthorTobyBartels
    • CommentTimeNov 17th 2009

    I don't normally get this error, but tomorrow morning I will try to load things simultaneously to test this.