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Two separate servers, one is an IIS7 web application trying to connect to a WCF service on the other server.

The initial connect always fails, sometimes the second, after that, everything works normal.

What could be the cause of this problem?

The exception that gets thrown is


Could not connect to net.tcp:// The connection attempt lasted for a time span of 00:00:21.0289348. TCP error code 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

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