RE: SOLVED! The cause of puzzling TCP (eg. WHOIS) connection failureswith some InterNIC.net hosts

The problem in this case is probably the load balancing systems that NSI is now using, which have known bogus behaviour when interacting with PMTU-D. NSI should disable PMTU-D on their servers until they can fix this problem; fixing this problem probably involves having the vendor for their load balancing boxes fixing their broken software.

What load balancing systems are known to mess up with PMTU-D ? Rubens Kuhl Jr.