Hmmm... Using Untangle devices to connect 4 branches: Houston, Dallas, Austin, and San Antonio.
VPN tunnels have been configured for some years and working for that same time period. About 6 to 9 months ago, we started having problems when trying to access network shares in Dallas (from any other branch). So, I can ping Dallas AND I CAN BROWSE some of the DALLAS shares. But most of the shares it allows me to browse are relatively empty (very few files). Anytime I try to drill down into a share that has a large (but not crazily so) number of files, I get an hourglass for a minute or so and then an error (\\server\share\directory is not accessible. You might not have permission to use the network resource... The specified nework name is no longer available.)
Of course, if I am on the LAN in Dallas, everything works great (I can access all the shares no problem).
Also, from Dallas, I can browse and access any shares on the remote servers in Houston, or Austin, or San Antonio - going through the VPN tunnels of course.
Last little tidbit of info... If I try to run an RDP session on the Dallas Server (from say Houston) going through the VPN tunnel, I connect but get a blank screen - no video. I CAN do an RDP session to the Dallas Server - but I have to come in directly from the Internet (ie, use the public IP address - not the VPN tunnel).
So, what kind of strangeness could be blocking/preventing network shares from working ?!?!? Any ideas !?!?