Problem

Gateway log contains the following warning:
NET071W 18.03.2011 17:58:30 (0) gethostbyname error = 11004.
NET071W 18.03.2011 17:58:30 (0) unable to dotify called address xfer.abcd.xyz/23, SecureRelay used by default.

What is its explanation and how can it be avoided?

Resolution

This warning message is encountered when all of the following 3 conditions are true:
1. Partner's name is used at Remote Site level instead of IP (xfer.abcd.xyz)
2. This name cannot be resolved by the Gateway (nslookup xfer.abcd.xyz)
3. The "Outgoing calls bypass Secure Relay for address mask" setting is used (in Gateway configuration - Connectivity - Secure Relay)

This is just a warning message and does not suggest any error.
The warning will disappear if any of the 3 conditions above becomes false.

Basically Gateway tries to resolve this name into an IP to determine if it needs to bypass Secure Relay or not.
Since this is not possible, Gateway raises this warning and passes the request to Secure Relay (that can, perhaps, resolve the name)