Hi,
We had an incident recently where our SQL Server was refusing remote connections. I was able to RDP onto the Server and connect to it locally. Someone was running an EntityFramework application which in turn blocked the Weekly Rebuild Index job on a particular database which in turn blocked other users from accessing the database. As its an extremely busy app the connections chain rapidly increased.
Running sp_who2 active revealed. 565 active connections. Is there a configurable threshold as to how may active connections will cause a DENIAL of Service? Is it dependent on resources, i.e how much RAM you have, or Network Bandwidth?
Once the offending app was killed and the active connections disappeared we were able to access the Server remotely again. But it will be good to understand the impact of Active Connections on a server maybe for setting up some alerts.
Thanks
