Any tricks for simulating a "Connection Timeout Expired" message?

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Any tricks for simulating a "Connection Timeout Expired" message?

mk_rp

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Points: 341
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April 29, 2014 at 2:26 pm

#288276

wondering if anyone, during their travels, has ever found a way to simulate a "Connection Timeout Expired" message.
It's to help reproduce a problem I'm trying to debug in our app, and it would be great if I could force this error at-will.
thanks in advance
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Grant Fritchey SSC Guru Points: 399061 More actions · Answer 1

Try using the WAITFOR command in T-SQL. That'll pause the execution of the query and you should see a timeout.

"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt

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mister.magoo SSC-Forever Points: 47174 More actions · Answer 2

Grant Fritchey (4/29/2014)
Try using the WAITFOR command in T-SQL. That'll pause the execution of the query and you should see a timeout.

Except that will be a Command Timeout, not a Connection Timeout.

Forcing a connection timeout could be as simple as adding a fake ip address to the hosts file on the test client machine for the DB Server, so that it never connects OR creating an alias on the client machine to achieve the same misdirection.

MM

select geometry::STGeomFromWKB(0x0106000000020000000103000000010000000B0000001000000000000840000000000000003DD8CCCCCCCCCC0840000000000000003DD8CCCCCCCCCC08408014AE47E17AFC3F040000000000104000CDCCCCCCCCEC3F9C999999999913408014AE47E17AFC3F9C99999999991340000000000000003D0000000000001440000000000000003D000000000000144000000000000000400400000000001040000000000000F03F100000000000084000000000000000401000000000000840000000000000003D0103000000010000000B000000000000000000143D000000000000003D009E99999999B93F000000000000003D009E99999999B93F8014AE47E17AFC3F400000000000F03F00CDCCCCCCCCEC3FA06666666666FE3F8014AE47E17AFC3FA06666666666FE3F000000000000003D1800000000000040000000000000003D18000000000000400000000000000040400000000000F03F000000000000F03F000000000000143D0000000000000040000000000000143D000000000000003D, 0);

mk_rp Old Hand Points: 341 More actions · Answer 3

Thanks both of you! I should have thought of: "Forcing a connection timeout could be as simple as adding a fake ip address to the hosts file on the test client machine for the DB Server"

That was the ticket.

-MK

mister.magoo SSC-Forever Points: 47174 More actions · Answer 4

Glad to help, and I hope your debugging goes well!

MM

select geometry::STGeomFromWKB(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

Grant Fritchey SSC Guru Points: 399061 More actions · Answer 5

mister.magoo (4/29/2014)
Grant Fritchey (4/29/2014)
Try using the WAITFOR command in T-SQL. That'll pause the execution of the query and you should see a timeout.
Except that will be a Command Timeout, not a Connection Timeout.
Forcing a connection timeout could be as simple as adding a fake ip address to the hosts file on the test client machine for the DB Server, so that it never connects OR creating an alias on the client machine to achieve the same misdirection.

Well, the command shouldn't time out with defaults set within SQL Server, but your answer is what the OP wanted.

"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt

Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning

Any tricks for simulating a "Connection Timeout Expired" message?

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