Hi,
We have an application server connects to a SQL 2008 R2 (sp2 cu7) server using a domain account and integrated authentication. It got timed out when trying to connect to the SQL server after 15 seconds and could establish the connection. This happened intermittently, not all the time. Nothing has changed on the application or the SQL server. Both the application and SQL servers (they are separate physical servers) are running on Windows 2008 R2 Enterprise edition.
Below are the errors from the application log:
2013.07.31 21:01:58 OCSQL: DB connect using SQL Server Native Client 10.0 to SERVER 'HOSTNAME;Database=DB1' user = '(null)'
2013.07.31 21:02:13 OCSQL: SQL code 0 : 08001 : [Microsoft][SQL Server Native Client 10.0]Unable to complete login process due to delay in opening server connection
2013.07.31 21:02:13 OCSQL: DB connect using SQL Server Native Client to SERVER 'HOSTNAME;Database=DB1' user = '(null)'
2013.07.31 21:02:13 OCSQL: SQL code 0 : IM002 : [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
I have checked the windows event log and the SQL server errorlog, but could not find any error on the SQL server machine around the time of connection time out.
The domain account that is used in this connection is from another different trusted domain in another country. For example, the application and SQL server are located in Singapore, the domain account is from Hong Kong, a different domain but trusted.
Could it be the delay at sometime in SQL getting the domain account authenicated due to the huge geographical distance in the two domains (Sigapore and Hong Kong) causing this timed out? If not what are other possible causes of this intermittent time out?