jrun error 413 header length too large

hi Carl,

I'm running cf9 on windows 7. working on little chat application which calls server every 5 seconds to check whether there are any  new messages. It saves current chat status to cookies too. At the earlier development stage it didn't interact with cookies and the error was not in presence. That would lead me to conclusion it has something to do with cookies. But I coded strict control over the size of it so it definitely does not exceed 4kb (actually I've trimmed it 2kb to test and yet receiving an error). Worth mentioning error does not come once application starts.

let's say I start conversation between two people (two different browsers) and IE randomly produces this error. It's completely not dependand on current cookie size as it appears randomly. sometimes when cookie is as little as 0.3kb. when it appears if I close the chat hence delete the cookie it continues working fine.

Internet explorer does not give me any error  explanation apart from that one line (in subject). Chrome however says it's a problem with cfinvoke. But the only cfinvoke function that runs constantly does not return anything as long as there are no messages so it doesn't make any sense why header length would be too large if it's returning absolutely nohing.

It's very complicated and i've already tested in so many ways but still can't originate what causes it. Therefore thought maybe there is some coldfusion log that would lead me to exactly what's happening at that very moment error occurs.

cheers,

Simon