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I have a small LAN containing three PCs (two on Win7 Ultimate x64 and one on XP Pro), a Samsung network laser, and a Drobo box (with DroboShare).

At some point in the recent past (and I'm not sure quite when), it appears that sharing and device discovery across the LAN have stopped working.

I'm thinking that it must be either a Windows update or an AVG update that has changed something - other protocols seem to work OK (POP, SMTP, and some proprietary ones are all working).

It's not a general IP connectivity issue: all the machines can access the internet etc, and one another over different protocols (e.g. VNC and email protocols), it's just Windows networking that's failed.

All machines use DHCP but with IP addresses that are consistent due to MAC binding in the router.

All PCs are in a workgroup (one machine is XP, so we don't use Homegroup).

Any pointers?

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migrated from Apr 30 '14 at 19:14

This question came from our site for system and network administrators.

You can't see hosts in workgroup browser? – Nafscript Jun 10 '15 at 4:50

I would verify windows sharing is still enabled.

On Windows 7 under Network and Sharing Center in the left pane, click Change advanced sharing settings and expand your current network profile.

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When I click on the "Network" in the left pane, it shows the machine I'm working on (which is called MEMPHIS). If I try to expand that, it says \\MEMPHIS is not accessible. You may not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. The Server service is not started. – Marc Wilson Apr 30 '14 at 18:33
Confirm you have windows sharing enabled on both windows 7 machines. What network location do you have selected for your network? (Home, Work, Public?) – l0sts0ck Apr 30 '14 at 18:37
Work. I've found another issue: there appears to be a missing service in my current machine. When I get open the Services snap-in, the "Server" service is indeed not running. In fact, it's not even listed! It seems to have disappeared from the list of services. – Marc Wilson Apr 30 '14 at 18:44
That'll do it. Click Start, Run. Type ncpa.cpl. Right-click on the LAN connection, and choose Properties. Click Install Select Service, and click Add. Select File and Printer Sharing for Microsoft Networks and Click OK. That should reinstall that server service. – l0sts0ck Apr 30 '14 at 18:47
I can get as far as "Add" - it then comes up with an empty box, with the only option being to select "Have Disk". – Marc Wilson Apr 30 '14 at 19:54

I Just had EXACTLY the same problem happen SUDDENLY to my LAN Network.. - I have Three-Four PCs Interconnected thru a Router (Win7 LT, Win8.1 DT, Win10TP DT, & on occasion, an old WinXP DT) - I use a Workgroup, not Windows HomeGroup - I CONTINUED to have Internet Access throughout my problem with my Local LAN - The thing that appeared VERY Strange was that when I opened my Network it showed ONLY the Router - It wouldn't even show the PC I was on as being part of the Local Network!

SOLUTION: It turned out that, for some reason I still do not know, AVG Firewall TURNED OFF FILE & PRINTER SHARING - When I Re-Enabled File & Printer Sharing thru AVG Firewall, All was Again Well :) - BJ51

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