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We have to expose our Team Foundation Server to the customers over the internet. One customer is able to log on using the WebAcecss (http://MyDomain:8080/tfs) but when he fires up TeamFoundationServer 2010 to connect to server from there, it simply doesn't work and he got the message: 'The underlying connection was closed: The connection was closed unexpectedly'. Do you know the answer to this issue?

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  • Have you checked your firewall and made sure nothing is being blocked? Can your client ping the TFS server and get a response? – Ryan Hayes Aug 22 '12 at 02:19
  • Thanks, well. I kinda find a workaround to the problem myself a few minutes ago. I was trying to used Fiddler to view the traffic and suddenly it works, with fiddler turned on. So my guess is there's some firewall problem – Nhím Hổ Báo Aug 22 '12 at 02:58

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It seems like an firewall issue. It works when the traffic is routed through Fiddler. (I accidentally discover it when using Fiddler to find out what's going on). These are 2 interesting articles for troubleshooting this kind of issues that I came across:

https://serverfault.com/questions/397999/team-foundation-server-an-existing-connection-was-forcibly-closed-by-the-remote

http://computech.in/2011/02/the-underlying-connection-was-closed-the-connection-was-closed-unexpectedly-team-foundation-server-does-not-exist-or-is-not-accessible-bypass-proxy-for-team-foundation-server/

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