This network issue threw me for a loop

I got sent to a network problem for one person in a office and some troubleshooting took place as well as some remediation steps. Basically the user had no network access all of a sudden. The computer had already been rebooted (the first thing IT people seem to recommend, right?)

The network card was removed from device manager and reinstalled. At that point I was dispatched to the client. I tried some basic stuff – swapped network cables. That didn’t work. Rebooted the switch. Forced the NIC into 100 Mbps Full – nope. 100 Mbps Half – nope. 1 Gbps – nope, nope. Scanned for malware. None found. I started working on it in the server room and after updating the NIC drivers, I got internet. Cool! It’s fixed.

Then I moved it back to the user’s desk and no internet again. Hmm…I guess it’s the cable drop between the network closet and the office. Temporary solution – move his computer to another desk. So we move all the components – PC, monitors, cables, keyboard, etc. And???

NO NETWORK AGAIN? Okaaay

Moved to another office on a different switch. Still no network. What? Back in the server room it started getting spotty network connectivity. Weird. Contacted Dell support and my manager. Ran a BIOS update and did a clean uninstall of the NIC from Device Manager. Reinstalled the NIC with fresh drivers from Dell. Seems to have network connectivity. Moved it back to the temporary desk. No network!!!

What is going on??

I’m scratching my head trying to figure it out. So on a whim, I decided to try 100 Mbps Full and I got network! Hooray! 1 Gbps doesn’t seem to work and Auto-negotiate doesn’t work either. So in the end it took a BIOS update, NIC driver refresh, and forcing the NIC to connect at 100 Mbps.

Nothing changed as far as I can determine. No updates were installed and the user didn’t change anything. Why it didn’t work all of sudden? Who knows? I’m just glad it’s working!

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