That means your network is able to route the connection to your Jira server, but the connections are getting no response to what it is sending. The server is accepting the incoming connection, but not sending anything back.
That means there is something running there, but it is not responding, or, more likely, the network is not sending/allowing the data back to your browser.
First, check that the Jira server is running. If it's not, get the admins to bring it up!
Second, if it is, and other people can reach it, then you need to look at the differences between what they're doing and what you are (could be different network routes, you're using a vpn, they're on-site near the server while you're remote - all that sort of stuff). To get you started in this case, I'd start looking at the proxy servers - this error happens a lot when they are misconfigured and set up to listen ok, but not send the responses back to the client!
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