Ah, that's Jira telling you that your network has closed a connection it was trying to use. Happens on slow, overloaded or badly configured networks sometimes (I've provoked it at home when I allocated two machines the same IP address for example). I'm not a network expert so I can't really tell you a lot more than it's likely to be network packets timing out.
I'm afraid the first thing to look at is your network, it's most likely to be a problem with the connection between the client (user's computer) and the Jira server.
The error you are getting is Jira saying "either your machine or I sent a packet to somewhere else, and I got no response within a reasonable time".
This is almost always a network error, although you can cause it with bad coding, or doing unusual things on the client. The fact that it's happening for you and not every other Jira installation implies that if it is bad code, it's client side, rather than Jira.
For an average user though, who is unlikely to be running odd network scanning/interception software, the only possibilties are dubious browsers and/or browser extensions, or a network problem.
Invalid credentials, with that error in the log makes sense and matches the "networking issue" diagnosis. The user is putting the right things in, their browser is sending it across, the network is losing part of the message and Jira times out and rejects the login because as far as it is concerned, they have not logged in.
I checked with our network team and they said its not there issue.If its the network related the JIRA login page will not appear at all however in my case it was appearing and although users were entering correct credentials it was giving message that invalid username and password.
any other suggestion?
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