We have several Win2016 servers. In particular a SQL and a Web. What we are seeing is that after some arbitrary number of days the web server can no longer make any queries. No sql backed application will run without error from the web server. The web server is unable to \\unc to sql and sql is unable to \\unc to the web. But both can \\unc to other servers just fine. The message in the web event log is "A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available." If I change the connection string in the web.config to our development sql everything works. SQL and Web can ping each other by name and by ip address. Both have host file entries pointing to each other. Neither is running a firewall. Nothing changes if we reboot the web server, but, in the past rebooting the production sql server does allow them to talk again. This is not a good fix. Any clues? Again, they do talk, then they just stop.