It's unusual to need to connect to all the computers. Most run some version of Windows such as XP or 7 and only support up to a few connections. So be sure to recall all those classes about networking. Your post is so light on details that I have to write that such was expected.
I have a small home network. I am having problems connecting to one of the computers on that network. I now have two computers that have the same problem with one of the network computers. When I try and open the offending computer I get told that it cannot find it.
If, however, I first run an ip scan (which has no problem finding the offending machine) I can,then, access that machine.
Oh, of the two computers having this problem, one is running xp and the other windows 7. I also have a linux machine on the network that does not have a problem with the offending machine.ipconfig
Thoughts? (thank you)