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Windows 7: reason network switch blocks computer on specific port?

02 Mar 2016   #1

Windows 7 x64, ultimate/pro/home, SLES x86 & ia64
reason network switch blocks computer on specific port?

have sort of a general / technical & how to fix question regarding a cisco switch,
the kind used in enterprise, I think it's a level 3 switch. And it has an uplink port that goes to another switch/router located wherever... making up the WAN.

On this one particular switch/router, let's call it switch A from here on.
normally everything is fine with the computers plugged into switch A, and all the computers physically plugged into switch A have a static ip address set but also having default gateway and DNS servers manually set. Everything has worked fine forever that way, including if any system was connected and set to use dhcp.

on one computer plugged into swithc A i tested a usb-to-ethernet adapter; the same physical port on switch A was used and instead of the network cable going into the computer motherboard network port it went into the usb-to-ethernet adapter. I verified the adapter worked, then removed it, and put everything back the way it had been. since then i have the following problem:

- from a remote pc on the WAN I can ssh in to any other system physically plugged into switch A except for that one computer that was tested with the usb-to-ethernet adapter. My other computers will respond to ping if i set their firewall to allow it, but the computer that was tested with the usb-to-ethernet adapter cannot be reached by any means from outside that switch A. And i am quite positive i have nothing misconfigured on the computer causing the problem. I have the other systems on that switch to reference for settings even.

- from a remote pc on the wan, if i first connect to any other system physically connected on switch A, i can then successfully ping and connect into that one system where the usb-to-ethernet adapter had been used.

what could cause this?
would cycling the power on switch A correct it?

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 reason network switch blocks computer on specific port?

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