Re: Very Strange Network Problem HELP!!!

From: Craig N. (cnash_at_xxplego.com)
Date: 07/16/04 

Date: Fri, 16 Jul 2004 20:25:24 GMT

1. I dont know why hubs, this is just what they have, theyre older. All the
workstations run into the hubs, none of the servers do, they all go to cisco
switches.

2. Yeah, and I have a speed and duplex match on both the servers and
switches, all running 100 meg full duplex. The nics are 100/gigabit, stock
built in for the HP DL380. Using standard Cat5, no fiber except for a NetApp
Filer.

3. I have basically ruled out all software issues, just because it worked on
that switch, AND I brought up the old servers that we replaved that had
always worked great, and they had the same problem. Although my Citrix guy
thinks it could be from loading off the HP install disks, he says its a
different kernel, and could cause this issue, but I am pesimistic, or the
old server would have worked, and it wouldnt have worked using the new
switch.

4. No roaming profiles, I have one single terminal services profile that
everyone uses, that way no one can change the desktop. The problem is also
on thin clients, so that doesnt make too much sense. We have tried roaming
and non-roaming previously, and nothing.

5. We have disabled all the policies, and no event logs errors at all.

6. Basically, I built a brand new Domain Controller, er, 2 anyways, one for
redundancy. Then a SQL Server for licensing, and the Citrix Server. I also
have a brand new EMC SAN system. This is all seperate on a different
network. When I test it, I unplug the current domain controllers, sql, NAS,
and citrix, and plug in this network. The servers are from scratch this
time, nothing cloned, nothing from the old network has touvhed this, I even
manually entered all the users into active directory.

7. I have removed the dc's one by one, and sql one by one, still nothing.

8. Citrix XPE feature relese 3.0, and I have had 2 certified Citrix experts
in here already, one is working with me now, and he is baffled, other than
this Kernel that HP uses. So he is going to rebuild Citrix AGAIN using the
actual Windows 2000 Disk.

Also, I ran a sniffer, and during the hang, I have 0 Network connectivity on
the box, until the hang stops, then network connectivity restarts.

Hope that helps.

"serverguy" <nospam@hatespam.com> wrote in message
news:e5lfKn1aEHA.2932@TK2MSFTNGP10.phx.gbl...
>I agree with Dave, and I would add:
>
> - why hubs?? Any possibility you could use just switches?
> - checked the speed/duplex settings of the ports and nics? What else can
> you describe about the nics in the servers and cabling? teamed? fiber?
> - have you definitely ruled out software issues? Are your citrix profiles
> local or roaming? I would eliminate any roaming profiles b/c they can be
> slow, you can do this with policies.
> - any other policies that might be loading to the clients? Maybe try
> disabling policies temporarily and build a fresh client. Any event log
> errors on the citrix servers or DCs?
> - when you said that you tested the servers separate from the network,
> how?
> did you have a domain controller also or just citrix server(s)? I am
> making
> many assumptions here - that you have cloned the citrix servers from
> identical builds? that you tried removing servers indivually from the
> farm?
> that no other network problems exist (w/SQL or domain replication, for
> example), and that it is definitely isolated to citrix only.
> - what version of citrix? have you called them yet?
>
>
> "Craig N." <cnash@xxplego.com> wrote in message
> news:9PJJc.262236$Gx4.157823@bgtnsc04-news.ops.worldnet.att.net...
>> I have a very strange problem here, been working on it for 4 months now,
>> hopefully someone can give me some advice.
>>
>> Anyways, I have a client with 200 users running Citrix. The network
>> configuration is:
>>
>> all main servers are HP DL380's, Dual xeon 3.0's, 1 gig of ram
>> 2 domain controllers - win'2000
>> 4 Citrix servers
>> 1 SQL server
>> 1 Print Server
>> 1 EMC Clarian SAN
>> 1 Lotus
>> 1 HP-UX running BPCS
>> Switches:
>> 4 Intel Express Hubs 12 Port
>> 2 3COM hubs
>> 2 HP 2524 Switches
>> 2 Cisco Catalyst 2900 Switches
>> 1 Cisco Catalyst 3500 Switch
>> 4 Old SMC Hubs for the phone system
>>
>> Anyways, the client was running old servers, so they upgraded to HP DL380
>> servers, and Citrix ran great, then a few days later it went to crap. The
>> logins were slow, trying to open office documents through office was slow
>> (but opening through explorer was not), and when typing, it would lag
>> real
>> bad. (This is Citrix Specific)
>>
>> I came in to try to fix it, and we tried everything until we finally
> rebuilt
>> the domain controllers and Citrix farm, since the problem really seemed
> like
>> a server issue. Well, after rebuilding from scratch, we stil had the same
>> problem, so we tested everything, and it looked good. I then got an idea,
> it
>> felt like it might be network traffic.
>>
>> I took a catalyst 2900 switch that had never been connected to the
> network,
>> and ran the servers to it, and 6 thin clients. We turned it on, and the
>> thing cruised. It rocked, logins were instant, it was the first time it
>> worked in 4 months. So, I figured I would track down the problem, I
> started
>> plugging in switches one at a time until the problem surfaced. I got all
> the
>> Intel hubs connected, nothing, then I connected the 3coms, still nothing,
>> and then the HP switches, so far so good.
>>
>> By now, its 1:00 AM, and I decide to go home, I quickly connect in the
> rest
>> of the switches at once, and BOOM, the problem shows up, so I figure I
> have
>> it down to only a few switches, lets go home and try tomorrow. I move the
>> network cables over to the old servers, then I Connect this switch into
> the
>> network, and leave. (It was easier, than moving cables everywhere, since
> the
>> switch room is seperate from the server room, and I was tired)
>>
>> Next Day, I'm excited, so I decide to show it off. WELL, I move my
>> network
>> cables to the old servers, and unplug the switch from the rest of the
>> network. The problem is back!!! I reboot the switch, I reboot the
>> servers,
>> nothing. I even swap network cables. This is the exact same configuration
> as
>> last night when it was running great. I dont get it. I guess maybe
> something
>> from one cisco switch has infected this one, who knows.
>>
>> I do know that the HP switches didnt cause a problem, so I empty them
>> out,
>> and plug in only my servers and thin clients, nothing else, completely
>> seperate from the network. STILL THE SAME PROBLEM!!
>>
>> This is weird, and I need to fix it. Its like whenever you add a switch,
> it
>> acquires this problem, but a brand new switch runs great until it is
>> connected to the network for any length of time. It ran great on the
>> other
>> switch for a good 5 hours, so I know its not the servers, gotta be the
>> switch. Does anyone have any ideas?
>>
>> I am resetting my catslyst to factory default then going to try it.
> Someone
>> please help, I need this up by monday.
>>
>>
>
>

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