It is not an ack, but the client receives the "noop" packet again. This means that the server never got an "ack" from its first request.
Aha.
Is there a firewall in between?
Nope.
Do you have multiple interfaces on that computer
Yes! Both of them have other interfaces on private IP address ranges.
(may the reply got sent using the other interface, and not recognized by the server). etc. etc.
I'll go away and investigate - thanks!
-- Illtud Daniel [EMAIL PROTECTED] Uwch Ddadansoddwr Systemau Senior Systems Analyst Llyfrgell Genedlaethol Cymru National Library of Wales Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW
