I have a Lenovo laptop that was set on DHCP and could not get an IP address. We tried it in several locations to eliminate it being any software or hardware issues and determined there was an issue in the laptop itself. We ran a Malware scan which came up clean and WinSockXPFix. We were then able to get an IP address through DHCP. Upon taking the laptop back to the business, we put it on it's docking station, turned it on and no IP address through DHCP. I removed it from the docking station and plug the cable in directly to the laptop, restarted the computer and still no DHCP. I then checked the port on the switch. It appeared to be OK. I then took the laptop back to the server room and took a cat5e cable with me and plugged the cable into the switch directly and then into the laptop. I DID get an IP address through DHCP. So, then I used the same port that was being used in the customer's office. Plus into that port with the same cat5e cable, restarted the laptop and I DID get an IP address. I then took the laptop back to the office, set it on the docking station. No IP address through DHCP, however I set a static on the laptop and we get internet and network both.
I am very puzzled as to how we are getting an IP address through DHCP at every location we tested except in the one location, however that same exact spot/cable works with static IP.
The same customer took his laptop to his other office and exact same office there. These two offices are connected via a full-time VPN connection.