This has me totally stumped.
PC will connect with no problems at home (wireless & wired). But if I try to connect in my office it will only connect wirelessly. Have tried the obvious such as swapping cables etc. but still get no internet connection. If I try a different PC the same network socket it will connect ok.
But if I disable the wireless adaptor then enable the wired, it will connect for a minute before dropping the connection (yellow warning triangle on network icon).