I am having a very odd problem with the Arduino IDE as of late. The actual program works fine, I can write and upload programs like normal. My problem is that when I start the IDE my NIC card on my desktop looses connection. I think it may have something to do with conflicting COM ports but I am not totally sure. I cannot seem to find any literature on the topic.
I am running the Arduino 1.8.2 suite and I have a Bigfoot E2100 network card.
Any suggestions are much appreciated.
I run a quite large selection of arduinos on various boxes with an array of NIC's and an assortment of IDE's and it is not an issue I have ever seen.
The NIC does not use a COM port nor have I seen one that does.
Not so much an answer but more of a suggestion.
Turn off any security software you have.
Try a simple upload to a board.
Double check the firewall options that you have and ensure the IDE is allowed to pass through as it often looks for board and library updates.
You didnt tell us what OS so this next one is a guess ... Make sure there are no devices marked in device manager with exclamation or question marks and if there is then fix them before doing anything at all.
That particular NIC is quite often no better than the onboard one if you have one so if there is an onboard pull the NIC out and use the built in.
The reason built ins are often better is that they are slightly more optimised to the motherboard than a general add in NIC.
EDIT There is a sticky post HERE and I would suggest your read it and add the missing info that may be needed to get a better answer.