Old  Macbook connects to corporate ethernet --- but not my new Macbook Pro

I've now tried nearly everything to solve this problem: My old white plastic Macbook connects to the corporate LAN --- but not my new mid-2009 Macbook Pro.
All the settings are the same. I have on occasion managed to connect the new Macbook Pro to the network but only for a short time.
Our IT folks have checked the cable, the ports,routers etc and everything is just fine.
I am able to connect to the network from other ports in the office --- but not from my office (except with the old white plastic Macbook).
Please, can someone help?

Fishbair wrote:
I've now tried nearly everything to solve this problem: My old white plastic Macbook connects to the corporate LAN --- but not my new mid-2009 Macbook Pro.
All the settings are the same. I have on occasion managed to connect the new Macbook Pro to the network but only for a short time.
Our IT folks have checked the cable, the ports,routers etc and everything is just fine.
I am able to connect to the network from other ports in the office --- but not from my office (except with the old white plastic Macbook).
Please, can someone help?
If you can connect when using other ports in your office the problem is almost a certainty that the issue is with the port you can't connect with. Did your IT guy switch ports at the switch side to one that is known to work? We can't troubleshoot your LAN and it sounds like your computer is set up correctly if it connects using other ports.

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