Client has a dangerously open instance of SQL Server 2005. VB.NET 1.1 connects to this from another server without problem. Turning on Windows firewall with port 1433 open to subnets only seems like a quick stopgap solution.
DB seems fine, but begins to slow down over the course of an hour... As though it is losing connections form it's pool. Eventually no connections are possible from the app or other tools.
Does SQL Server require other ports to be open?
Linux guy here scratching his head.