One of my computers in LAN is often invisible for other computers. From this computers point of view, LAN and Internet connections are present non-stop. All computers have static local IP.

1. make sure it is on the same IP range/ subnet (192.168.1.xx is different from 192.168.2.xx) 2. make sure the default gateway IP is the same as your router, 3. make sure your Primary DNS IP is the same as your router (unless you run DNS yourself or your ISP says otherwise) 4. enable UPnP will help show some of your folder shares 5. check firewall. Norton can be an arse, but also windows firewall can block connections regards jay

Thank you for your reply, Jay. All computers are in same IP range, with same subnet mask. Firewalls are disabled on all the machines here. About 30% of time this problematic machine is visible from other machines but most of times it is not.

is this computer on wireless?

Nope, this is your average LAN with a CANYON 8-port 10/100M Ethernet Mini Switch. There are between 6 and 12 computers here at working hours every business day. Some notebooks are not always present but every one of them has its own IP.

What about the workgroup? I am still waiting to try this on a computer of a friend to see if it works, maybe you can check on yours, thanks. AskJuba

Verify that the following 3 services are running on all computers and their startup is set to automatic. Computer Browser -> Maintains an up-to-date list of computers on your network and supplies the list to programs that request it. Server -> Provides RPC support and file, print, and named pipe sharing. Workstation -> Provides network connections and communications. The population of "My Network Places" can be fairly slow. I don't recall the exact amount of time of the maximum delay for the population, but I think it can be between 45-54 minutes.