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GregDSelwah
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Weird router suddenly stops computer by mac address

O.K. I got called into a medical clinic to look at a computer that would not connect to the internet or any local network resources (this is a small 3 computer LAN used for a small medical clinic). I first checked the cable and verified it as working. I gave the computer in question a static ip address and it looked like it connected but still would/could not ping local address's. I removed the internet security to see if the firewall was somehow stopping anything. Nope same results. no connection.

I took the computer back to my shop as i thought it might be a faulty NIC (it's onboard) plugged it in and it connect via DHCP no problem. The only thing that could be blocking it is the router. I did go into the router and changed the ip address that was given to that computer as it was in a DHCP reservation list.

The computers were all turned off and no one was using them for 4 days as it was easter holidays. When they came back in and fired the computers up just one of them would not connect. What would cause this to happen? I'm like WTF?
Microsoft Legacy OSDHCPRouters

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David_AF

8/22/2022 - Mon
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GregDSelwah

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I originally took that CAT5 cable and unplugged it from the desktop and plugged it into my laptop and it connected no problem so that's how I verified the cable was working.

I brought the computer back to the clinic yesterday and plugged everything in and lo and behold it connected no problems what so ever.

I thought it was the router blocking it at first as well, but when I plugged it in after verifying the NIC card was O.K. at my shop and it connected at the clinic with no problems, I'm at a loss as to why it did this in the first place.

The desktop is in a confined space and the only thing I can think of is a heating issue after going through all that.
David_AF

I've encountered problems that were inexplicable cases of certain parts "not liking" each other.  Computer parts (especially consumer parts) can become "brain damaged" and still work when tested, but not work properly in actual use.  Be sure to actually try a PCIe NIC card in the same situation and see if it is works.
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