We're a low-budget shop (see blog title, above), so we reuse patch cables. We've been reusing patch cables for about twelve years, and some have gotten a bit worn.
I installed a new server (reprovisioned an old server in a new location) yesterday, and was having difficulty initializing a Remote Desktop Connection to it. My initial thought was that the problem was some sort of bizzare hardware/software thing,* but it turned out to be much simpler: The patch cable in the telephone closet was faulty. It was adequate to get a DHCP lease and maintain a network presence, but just couldn't keep an RDP connection active. Replacing the patch cable to the switch fixed it, and its network connection now works as well as you'd expect it to.
If there's an odd performance issue on your network, the problem might be in a lower layer than you think.
* This server configuration is just weird.** It's got two Xeon 64-bit processors, but no VT extensions. It's got twin 15K SCSI drives, but the optical drive is CD-ROM. IT's got 2GB of RAM installed, but only the first 256MB are reported, etc. And it's got loud fans.
** I inherited it.
** I inherited it.
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