JSI Tip 7876. The Exchange 2000 message services cannot connect to the Exchange routing service on the local Windows 2000 computer?

When you experience the subject behavior, you may receive a 10060 connection timed out error message.

The following message services may be affected:

Simple Mail Transfer Protocol (SMTP)
Message Transfer Agent (MTA)

This behavior will occur if the subnet mask on the host computer is, causing the source address to be invalid when a loop back packet is processed on the receive side.

To workaround this problem, use a valid subnet mask.

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