'connection reset for concurrent usage by two users GAE

I am trying to access same python web app in GAE from firefox and IE with different user login and when I start the IE session I get the following error with IE going standstill. why?

error: (10054, 'Connection reset by peer')


Solution 1:[1]

Eclipse creates multiple instances on range of ports and few of them conflicts with pythons working. I could not locate the exact port or did not know how to stop eclipse from doing so. I did simple netstat and observed this behavior of port capturing and causing reset

Solution 2:[2]

I presume this is on the dev_appserver? Bear in mind that the dev_appserver is single-threaded, so it will not handle multiple concurrent users well.

Can you give more detail about exactly what sequence of operations causes this? Are there any stack traces on the dev_appserver console when it happens?

Solution 3:[3]

Do you get a similar outcome when you start the IE session first, then the Firefox session? what about trying two IE sessions, two Firefox sessions, that why you can rule in/out browser differences.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 dhaval
Solution 2 Nick Johnson
Solution 3 Chris Huang-Leaver