Comments on: Slow TcpClient Connection (sockets)

By: Jason Smith

Jason Smith — Fri, 21 May 2010 14:50:34 +0000

Using the TcpClient() constructor with no parameters works only with ipV4 which is why you are noticing this difference.

See here: http://msdn.microsoft.com/en-us/library/aa329755(v=VS.71).aspx

By: Pedro Duarte

Pedro Duarte — Fri, 02 Oct 2009 15:03:52 +0000

I had the same problem with Windows Vista and 7, and with this solution it works very fast.

By: Schotime

Schotime — Fri, 27 Jun 2008 02:05:11 +0000

Mike,

This is also related to the slow response from firefox when running on localhost with vista.

The reason for it is because of the ipv6 protocol. In the hosts file of your pc under vista there is two entries for localhost. One for ipv6 and one for ipv4. I have now just commented out the ipv6 one with a # and everything is as fast as it should be now (<4ms).

Its obviously taking 1 second to decide which protocol to use or gets confused. Something….whatever. haha. Least it works now.

Hope this helps everyone.
Thanks for the comments Mike.

By: Mike Koss

Mike Koss — Thu, 26 Jun 2008 21:22:43 +0000

I found your post trying to debug a local Python web server I’m running. Requests were also taking about 1 second each, when they should be nearly instantaneous.

One change I made, connect to “127.0.0.1″ insead of “localhost” -> now everything is fast again!

Is Vista doing a DNS call (and timing out), before connecting to the local machine???