Computers no longer listed in the Network on our domain

Computers in our domain have Function Discovery Resource Publication service turned off.

I just noticed today when clicking on the "Network" that none of the computers were listed.  So after checking the services I found this set to manual and turned off.

What would all of a sudden cause this?
J.R. SitmanIT DirectorAsked:
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Maybe a recent update caused it?

Also this can be a side effect of wrong atni-virus/firewall configuration.
J.R. SitmanIT DirectorAuthor Commented:
firewall is turned off and Anti-virus has not changed in years
J.R. SitmanIT DirectorAuthor Commented:
turns out it was a problem with the DNS server not having the correct Gateway.  After I fixed that all the computers were visible.

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J.R. SitmanIT DirectorAuthor Commented:
Found my own solution
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