network hangup

help!! this is my problem
every time a particular nms agency logs in to the network to work on there
2k3
servers, some of the switches hang and not the same ones every time.
i have a flat network running on a gigabit fibre backbone,
the infrastrusture has been tested to death by 4 outside agencies and found
to be
without problems, all the switches have the latest firmware upgrades and past
all diagnostics.
i have 2 outside links both of 10MB half duplex fibre going
to 2 different providers, one provider gives me external ip's the other is
part of the county group to which this site belongs,
it does not matter which of the providers this company comes in on the same
result, but when they come in on a cisco pix box through one ip and one udp
port all other external ip's and ports have been closed then i don't get
network hangup,

when this company is not alowed access again and all the ports and ip's i
need are reinstated i don't get network hangup (i need to be able to
use some of my other 254 external ip's for various projects)
the outside company claims that it is nothing to do with them and not a
problem generated by them
i have to take their word for as i am not allowed to see the anything on
their servers (office politics), but do have to diagnose and resolve all it
related problems on this site.
i have gotten extremely close to this problem and may be missing
something.
anyone got any ideas?

In news:046D8B00-8F52-41FA-8157-(E-Mail Removed),
tom yandell <(E-Mail Removed)> stated, which I commented
on below:
> help!! this is my problem
> every time a particular nms agency logs in to the network to work on
> there 2k3
> servers, some of the switches hang and not the same ones every time.
> i have a flat network running on a gigabit fibre backbone,
> the infrastrusture has been tested to death by 4 outside agencies and
> found to be
> without problems, all the switches have the latest firmware upgrades
> and past all diagnostics.
> i have 2 outside links both of 10MB half duplex fibre going
> to 2 different providers, one provider gives me external ip's the
> other is part of the county group to which this site belongs,
> it does not matter which of the providers this company comes in on
> the same result, but when they come in on a cisco pix box through one
> ip and one udp port all other external ip's and ports have been
> closed then i don't get network hangup,
>
> when this company is not alowed access again and all the ports and
> ip's i need are reinstated i don't get network hangup (i need to be
> able to
> use some of my other 254 external ip's for various projects)
> the outside company claims that it is nothing to do with them and not
> a problem generated by them
> i have to take their word for as i am not allowed to see the anything
> on their servers (office politics), but do have to diagnose and
> resolve all it related problems on this site.
> i have gotten extremely close to this problem and may be missing
> something.
> anyone got any ideas?

I've seen this issue due to a looping with multiple switches. I had them
re-wire the way they plugged the switches together and disable spanning tree
and it seemed to do the trick. Difficult to tell in your scnerio since it
would be something I would need to be on site to investigate, but it may
give you a start.

I hope it helps.

--
Ace

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Having difficulty reading or finding responses to your post?
Instead of the website you're using, I suggest to use OEx (Outlook Express
or any other newsreader), and configure a news account, pointing to
news.microsoft.com. This is a direct link to the Microsoft Public
Newsgroups. It is FREE and requires NO ISP's Usenet account. OEx allows you
to easily find, track threads, cross-post, sort by date, poster's name,
watched threads or subject.

It's easy:
How to Configure OEx for Internet News
http://support.microsoft.com/?id=171164

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft MVP - Directory Services
Microsoft Certified Trainer

Infinite Diversities in Infinite Combinations
Assimilation Imminent. Resistance is Futile
"Very funny Scotty. Now, beam down my clothes."

The only thing in life is change. Anything more is a blackhole consuming
unnecessary energy. - [Me]

thanks for anawering
i've been down that road, nothing internal my switches might as well not be
managed i have that much turned off,
every single nic has had fastlink or whatever the particular manufacturer
calls it turned off
possibility of an external loop but i am assured by those that administer
them that this is not possible, (all parties have links to janet/superjanet)
my feeling at the moment is that there is something going on when the remote
administration is enabled to the 3 2k3 servers,
so far i have found several big faults with the initial installation of the
servers which i had to fault find by other means so cannot rule out the
remote administration

if you have any other ideas they will be most welcome

"Ace Fekay [MVP]" wrote:

> In news:046D8B00-8F52-41FA-8157-(E-Mail Removed),
> tom yandell <(E-Mail Removed)> stated, which I commented
> on below:
> > help!! this is my problem
> > every time a particular nms agency logs in to the network to work on
> > there 2k3
> > servers, some of the switches hang and not the same ones every time.
> > i have a flat network running on a gigabit fibre backbone,
> > the infrastrusture has been tested to death by 4 outside agencies and
> > found to be
> > without problems, all the switches have the latest firmware upgrades
> > and past all diagnostics.
> > i have 2 outside links both of 10MB half duplex fibre going
> > to 2 different providers, one provider gives me external ip's the
> > other is part of the county group to which this site belongs,
> > it does not matter which of the providers this company comes in on
> > the same result, but when they come in on a cisco pix box through one
> > ip and one udp port all other external ip's and ports have been
> > closed then i don't get network hangup,
> >
> > when this company is not alowed access again and all the ports and
> > ip's i need are reinstated i don't get network hangup (i need to be
> > able to
> > use some of my other 254 external ip's for various projects)
> > the outside company claims that it is nothing to do with them and not
> > a problem generated by them
> > i have to take their word for as i am not allowed to see the anything
> > on their servers (office politics), but do have to diagnose and
> > resolve all it related problems on this site.
> > i have gotten extremely close to this problem and may be missing
> > something.
> > anyone got any ideas?
>
> I've seen this issue due to a looping with multiple switches. I had them
> re-wire the way they plugged the switches together and disable spanning tree
> and it seemed to do the trick. Difficult to tell in your scnerio since it
> would be something I would need to be on site to investigate, but it may
> give you a start.
>
> I hope it helps.
>
> --
> Ace
>
> This posting is provided "AS-IS" with no warranties or guarantees and
> confers no rights.
>
> Having difficulty reading or finding responses to your post?
> Instead of the website you're using, I suggest to use OEx (Outlook Express
> or any other newsreader), and configure a news account, pointing to
> news.microsoft.com. This is a direct link to the Microsoft Public
> Newsgroups. It is FREE and requires NO ISP's Usenet account. OEx allows you
> to easily find, track threads, cross-post, sort by date, poster's name,
> watched threads or subject.
>
> It's easy:
> How to Configure OEx for Internet News
> http://support.microsoft.com/?id=171164
>
> Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
> Microsoft MVP - Directory Services
> Microsoft Certified Trainer
>
> Infinite Diversities in Infinite Combinations
> Assimilation Imminent. Resistance is Futile
> "Very funny Scotty. Now, beam down my clothes."
>
> The only thing in life is change. Anything more is a blackhole consuming
> unnecessary energy. - [Me]
>
>
>

In news:3ED5FAF3-B6AB-4708-8715-(E-Mail Removed),
tom yandell <(E-Mail Removed)> stated, which I commented
on below:
> thanks for anawering
> i've been down that road, nothing internal my switches might as well
> not be managed i have that much turned off,
> every single nic has had fastlink or whatever the particular
> manufacturer calls it turned off
> possibility of an external loop but i am assured by those that
> administer them that this is not possible, (all parties have links to
> janet/superjanet) my feeling at the moment is that there is something
> going on when the remote administration is enabled to the 3 2k3
> servers,
> so far i have found several big faults with the initial installation
> of the servers which i had to fault find by other means so cannot
> rule out the remote administration
>
> if you have any other ideas they will be most welcome

Sorry, there's nothing else I can think of (gyrating thru all the possible
things that RDP requires) other than just as a reminder that RDP requires
TCP 3389 as well as UDP 3389. If that's blocked or something else is up with
VLANs or something in the switches that can be blocking it or redirecting
it, or a firewall somewhere else, that can be an issue, but other than that,
I'm sorry.

Ace