Okay, I'm going completely out of my mind. I am at the end of my rope with
this problem and I have no idea where to go from here. Basically, I'm
begging for suggestions!
Several PCs at one of our branches are having difficulty running a certain
application, which uses IPX on 802.3 frames. We are also running IP on this
LAN with arpa frames. There is a file server and printer on this LAN, and
all IPX traffic is between the hosts and that file server.
We are have ZERO problems with IP traffic on this LAN. I've been pinging
the tar out the hosts and they act perfectly normal, except for the file
server which had, at worst, a 98% success rate over time.
On our ethernet switch, we are seeing alignment errors and CRC errors coming
from the file server. The cable has been replaced and we verified that it
is cat 5, but the problems still exist. This is a new file server with a
new NIC.
Okay, the problem is that this particular application takes forever to run
from a desktop out in the building. yet, if you bring that very PC back to
the room where the switch is, the application runs very quickly. This led
us to believe that the cabling was bad. However, if the cabling were bad,
why are we having no problems with IP traffic? None at all! That just
doesn't make any sense to me.
Granted, the cabling out to the desks is Cat 3 and this branch has had some
previous EMI problems in the room, but I just don't see how EMI could
selectively cause one application to fail without there being some
indication of problems with other applications.
I've considered replacing the switch, but the problem only happens when a PC
out in the main room uses the application, no matter what port it is
connected to. Bring a PC back to the switch room and connect it to any port
and the program runs as advertised. So, I'm not going to waste my time with
that. I've also considered replacing the NIC in the server since we're
seeing errors coming from it, but that would not explain the problems we're
having, anyway, so that is probably pointless.
any ideas? Our next step is to hire a very expensive data center design
company to go up there and check things out. We've had electricians check
the room and they said they could find no obvious sources of EMI, even
though we know that it is prevalent there.
Help...please help....I'm dying here, and I'm quickly losing faith in my
troubleshooting skills!
TIA,
John
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