Re: Very Strange Network Problem HELP!!!
From: Dave (noone_at_nowhere.com)
Date: 07/16/04
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Date: Fri, 16 Jul 2004 21:45:01 -0000
'zero connectivity' and worries about 'touching' the old network seem odd.
what were you sniffing for, just normal network traffic or all protocols?
there are some worms/spyware/addware that generate ping storms, and other
non-typical traffic that can bring switches and routers to their knees
quickly. some of these are not detected by av programs, you have to scan
with things like spybot and adaware. if there is really 'no connectivity'
when this happens there should either be an event log message showing that
something has timed out waiting for dns, a master browser change, loss of
cable connection, or some such error... or some indication of the system
getting stuck at 100% utilization or some other odd condition so that it
stops serving the network, that should show on the normal task manager... i
would try setting up one system to ping the others constantly and then cause
the problem to occur, watching the pings may give some idea which end (or
the middle) stops responding.
"Craig N." <cnash@xxplego.com> wrote in message
news:qDXJc.102063$OB3.67513@bgtnsc05-news.ops.worldnet.att.net...
> We have tried a few things. First, a single user, with the servers on just
a
> linksys 8-port seemed to work fine, but its actually hard to say because
one
> user doesnt really encounter problems. BUT, today we actually did the same
> thing again, and with only one user, all connected through the linksys
> switch, and we do have the problem again. This is weird, although now that
I
> think about it, yesterday, in between when it was running great, and
running
> like crap, this citrix server was connected to the current network and
some
> files were transfered. Virus scans dont show anything.
>
> See, when we had it running great, it was just the servers, and 6 thin
> clients connected to a brand new switch. The only two things that changed
> were that the switch was on the network for a day, and this server did
touch
> the current environment.
>
> I am at a point now where no matter what combination, it doesnt work (and
it
> is instant, not gradual), never has until we put up that new switch and
had
> it all seperate, but now even that doesnt work. What we have here:
> -Old generic brand servers with citrix, which use to run great.
> - Current citrix servers on HP Dl380 G3 servers
> -Brand new Citrix servers built from scratch, running on HP DL380 G3
> servers.
>
> The current servers worked fine for about 3 days, then the problem
happened,
> before that with the real old servers, we never had any problems, SO.
> I hooked up the old old servers, and still the same problem. I have 3
> different sets of servers, all built from scratch by different people that
> all have the same problem. So it doesnt seem like a server issue, plus, It
> did work on a brand new switch, until something happened that next day.
>
> My citrix expert thinks it could be the Kernel that is on the HP install
> disks, he says that causes this problem, but honestly, that doesnt make
> sense since the non HP servers have the problem, and we DID have it
working
> through that switch. He's rebuiloding it now, so if it is a virus, its
gone,
> and if his "solution" doesnt work, then I at least have a clean slate to
> start on, and I did take that cisco switch and blow the config off of it,
so
> i'll try all that agian,
>
> Possibly a virus though? I run norton on every system.
>
> The sniffer that I ran can only analyze traffic coming in and out of the
box
> its run on, and what we saw was 0 connectivity during the problem. Any
> recommendations for a full network sniffer?
>
>
>
>
>
> "Rick Chisholm" <rchisholm@NOSPAMsouthlandonline.com> wrote in message
> news:%23dIU9Y3aEHA.1656@TK2MSFTNGP09.phx.gbl...
> > clarify something for me - if you plug in your DC, a Citrix server and a
> > thin client all into the same switch (or hub) with not other connections
> > or uplinks - does it work?
> >
> > All the "new server, old server, rebuilt and replaced" has me a little
> > confused. Are we at a point where no matter which combination you try
you
> > get no connectivity or just poor performance - or does it always start
out
> > fine then 'collapse' at some point?
> >
> > your traces with the sniffer show no abnormal traffic, broadcast storms
or
> > other net quirks?
> >
> > Rick
>
>
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