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Network connection between two Windows servers is really slow

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by johnaaaaaa20

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Server 1 is Windows 2003 SBS, Server 2 is Windows 2000 Server. Both members of the same domain. Server 1 is the domain controller. Copying files between the two is incredibly slow (like .05 MB/s), but copying files to and from Server 1 to another PC on the network is fast, and copying files to and from Server 2 to another PC on the network is fast. All the equipment is plugged into the same switch.

Server 2 has a Gigabit NIC which reported it had a Gigabit connection even though the switch only supports 100Mb/s. I set it to 100Mb/s Full Duplex in the past and it fixed this problem, then it happened again and I changed it back to Auto and that fixed the problem. Now I changed it back to 100Mb/s and the problem is still there.

Any ideas on what would cause this? There are no relevant errors in the Event log.

2 replies

by robo_dev

tried a crossover cable between the two servers?

Gigabit ethernet uses all eight wires of the patch cable, so if the nic is detecting gigabit, I would say a bad nic, bad patch cable, or bad switch port.

Patch cable run too close to a power supply or crossing a power cord??

If it's a smart switch, then mis-negotiation of duplex settings will cause the port CRC error counters to go crazy. A bad patch cable might cause it to negotiate wrong and then tons of CRC errors would be the result (along with slow performance).

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