Disable Firewall (on the “Server”) and see if works. DB connectivity requires 2 open ports (1433 and 1434).
It also requires SQL TCP/IP protocol to be enabled. Use SQL Server Configuration Manager to verify this (this is not SSMS) …
The config manager is an MMC snap-in (a *.msc file) that you should find in your Start Menu, but if you don’t see it, you can search for “SQLServerManager”, and it will be located somewhere like this:
Look at all entries that mention “Protocol” and ensure TCP/IP is enabled …
C:\WINDOWS\SysWOW64\SQLServerManager13.msc
Also, verify that the Network Connections on all Terminals are set to Private/Work/Home and NOT Public.
