'Error establishing socket' due to too many TCP sockets
Hallo
I have an app running on Win 2000, SP 3, JRE 1.2, connecting with a MSSQL 2000 DB using MS JDBC drivers and constantly writing updates to this DB. It starts off fine and continues for quite some time before encountering the following exception:
java.sql.SQLException: [Microsoft][SQLServer JDBC Driver]Error establishing socket.
Checking the output from netstat while the application is running revealed a huge number of sockets which are aparently used by the application since closing the application causes all these connections to be closed. I assumed that this may be the cause of the exception.
The application only connects with the database once and statements and resultsets are closed after use.
The same application running at other sites with more-or-less the same environment does not cause as many open sockets.
Can anybody tell why so manu sockets are created and not closed ? Any suggestions will be much appreciated.
Regards
Dawie
As an update, I was using connection pooling, and removed it. Now I create a connection per request and explicitly close the connection when done. This accomplished two things, reduced the number of stale connections, and also "throttled" down the process somewhat (not by much as in testing I found the average response times slowed by only a couple milliseconds).
I did do a netstat on the application server when I started receiving all the errors and found, like dawiemoller did, there was a VERY large number of stale connections to the SQL 2000 server. I wasn't able to telnet into the SQL server and port, as expected. Restarting the Java app on the application server cleared up all the stale connections.
After I removed the connection pooling, I've yet to receive the "error establishing socket" error, however after checking netstat again, I did find that there are still a lot of stale connections, just not nearly as many.
If this is a Microsoft bug, why would the stale connections go away after restarting the Java Application? Microsoft IIS is also running on the same server with database access to the SQL 2000 server and it isn't having any trouble. Could it be just a combination of this "bug" and using Microsoft's JDBC driver (SP1) to SQL 2000? Would switching to another vendors JDBC driver avoid this problem?
Scott Reynolds
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