I'm getting extremely long delays (10~30 seconds) in SQL Server Management Studio 2014 when attempting to connect to a SQL Server 2012 instance over TCP using Windows Authentication. This happens when connecting Object Explorer or a new blank query window. Once connected, running queries is fast. The problem does not happen when I connect using SQL Server authentication.
Environment:
- Windows 7, logged in as a domain user
- TCP connection via IP address (not hostname)
- The server is at a remote location connected via VPN
- No encryption
When I logged into a co-worker's Windows 7 computer with my domain account, and connected to the same SQL Server through the same VPN, there was no delay. When the same co-worker logged into my PC with his own domain account, he experienced the delay. These tests show that the problem is unique to my PC. Also, the problem only appears when connecting to this specific SQL Server and VPN; I can connect to other SQL Servers on the local network via Windows Authentication without any delay.
Things I've tried with no success:
- Disabled anti-virus and firewall
- Renamed the "12.0" folder under "%userprofile%\AppData\Roaming\Microsoft\SQL Server Management Studio" to "_12.0" to force SSMS to recreate my user settings.
- Force Network protocol to TCP rather than
<default>. I also tried Named Pipes but my server isn't setup for that. - Installed SSMS 2012 and tried that instead of 2014.
- Disabled IPv6
- Blackholed crl.microsoft.com to 127.0.0.1 in my etc\hosts file.
- Disabled the Customer Experience Improvement Program in SSMS, Visual Studio, and Windows.
- Uninstalled all SQL Server related apps from my PC and reinstalled just 2012.
TCPView clues:
- Using TCPView, I noticed that when I make a new connection, its state becomes ESTABLISHED right away, but then one or two more connections with the SQL Server are continually attempted and closed with TIME_WAIT. On my co-worker's computer, these connections are ESTABLISHED and solid. So I'm pretty sure this is the source of the timeouts, but what are the connections for, and why do they fail? (I don't have any addons in my SSMS.)
Any ideas?
Update: Intellisense/Autocomplete clue(?):
I noticed that once I finally do connect, Intellisense/Autocomplete doesn't work. Do those require separate connections from SSMS? I tried disabling them, and it didn't seem to resolve the long connection delay.
Best Answer
Try running a trace with SQL Profiler while you, and then your coworker, connect to the server.
Select RPC, SQL Statement & PreConnect - Starting/Completed.
Select Save Results To Table option, then compare the 2 tables to find the bottleneck.
Or, since you're connecting by IP, it could be doing a Reverse DNS lookup. If so, add a entry in your hosts file.