[Bug 261291] ESX NFS4.1 client hangs, server never responds to EXCHANGE_ID/CREATE_SESSION

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261291

--- Comment #11 from Rick Macklem <rmacklem@FreeBSD.org> ---
I took another look at the packet trace, focusing on
the TCP stuff starting around packet #644.
(You should look too, because my TCP is minimal and rusty.)

Starting at packet# 657, 659,... there are ACKs from the
VMware client to the FreeBSD NFS server and they all list
a "Win=2048".
Does that mean that FreeBSD can only send 2048 bytes?
- This window does not seem to open up.

Please take a look and maybe get someone conversant with
TCP to look as well.

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