Broken Shared List in Finder

I'm on Snow Leopard (10.6.8) in a last-generation MacBook Pro and having trouble with the Shared list in Finder. A few months ago, it stopped showing the server on the network at work. I see corworker computers still and can connect via Cmd+K, but it used to detect the server and allow one-click access. It's not a major inconvenience, but I'd like to know if there's any setting I'm missing. My coworkers' computers show the server just fine. I had to install a client's VPN client around the time this issue came up, but I'm not sure that's it. Any ideas?

There is an user appearing in my finder's sidebar (under "shared") as well.
Already activated the firewall, encrypted my home folder, all connections are blocked and the sharing feature has everything unchecked. I can still see him as "my guest".
My computer warned me twice about "somebody using my IP Address" , but I'm an ordinary user. Hence, don't have any "profound" knowledge whatsoever (meaning, there are a bunch of things I don't know how to use or interpret)
I don't know what measures to take if any. Is there anything else I can do to block my uninvited guest?

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