I found the issue... one of the farm IP's was in collision with a VM that was
intermittently starting so I didn't originally see the ip as up or in use..
Thanks.
From: Emilio Campos [mailto:[email protected]]
Sent: Tuesday, September 11, 2012 12:41 PM
To: [email protected]
Subject: Re: [Zenloadbalancer-support] TCP farm connection issues
what kind of farm are you working with? TCP farms have a limit by default 257
that you can modify if you need:
Max number of clients memorized in the farm.
Take a look to this field, maybe your farm is opening the max of tcp socket
allowed, increment the value to 1024 for example and let us know.
Regards
2012/9/11 Steve LePage <[email protected]<mailto:[email protected]>>
Ok another interesting discovery...
The farm is up working and forwarding tcp socket connections from it's VIP ->
backend, all of a sudden it stops forwarding.
- I use telnet to create a tcp socket from an external pc to the backend and it
connects.
- I use that same external pc to telnet to VIP and it tries to connect and then
it fails.
- From inside the Load Balancer I telnet to the backend and it connects.
This would indicate issue with network pertaining to VIP IP but......
I connect to a different tcp farm (same setup on same VIP but different port
going to same backend)
And it works.... Eventually this working farm does the same
SO when the forwarding stops I stop the farm wait a second then start it... I
still can't connect right away but after a few minutes the connections start
working again..
Very strange.. It seems like I'm hitting some sort of forwarding connection
limit or the LB is blacklisting me..
From: Emilio Campos
[mailto:[email protected]<mailto:[email protected]>]
Sent: Tuesday, September 11, 2012 10:36 AM
To:
[email protected]<mailto:[email protected]>
Subject: Re: [Zenloadbalancer-support] TCP farm connection issues
Steve it isn't a zlb version problem because the binary that do the load
balancing is the same in both. It sounds like a network issue.
p.s.: You don't see down the backends in the moment that you run the farm
because the lb only checks backends in the moment that it has to send a
connection to the backend.
2012/9/11 Steve LePage <[email protected]<mailto:[email protected]>>
In our live environment I have zen 1.0 stable performing simple TCP
loadbalancing between as asp.net<http://asp.net> frontend and a c# backend
service on port 7000. This works fine and I couldn't be happier... I just setup
a V2 stable env for testing and every time I try it I see after a few
connections that the Farm / backend in the LB stay green and I can telnet to
the backend on port 7000 but if I use the Virtual LB IP it states connection
refused..... What would make the LB see the farm as up and the backend as up
but stop connections via tcp? I see no errors in the logs and I see no
connection debug messages when I try to connect just simply connection
refused...
Also is it possible to download older versions of the iso's?
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