When I tried to kill one idle connection. Using the below query

select pg_terminate_backend(24861);

I am getting the below log.

2021-07-26 18:45:32 UTC:[24861]:FATAL: terminating connection due to administrator command
2021-07-26 18:45:33 UTC:[unknown]@[unknown]:[543]:LOG: PID 24861 in cancel request did not match any process

It seems like the PID disappears after this query. Because when I run this query again I get the below log.

postgres@postgres:[26522]:WARNING: PID 24861 is not a PostgreSQL server process

But one more idle connection is being opened under a different PID.

For example, if I have a 400 idle connection and if I kill all those connections using this query

SELECT pg_terminate_backend(pid) FROM pg_stat_activity
WHERE datname = current_database() 
AND pid <> pg_backend_pid()
AND state in ('idle');

Then another 400 idle connections are being opened under different PIDs. But I don't see anything in the log like this connection being created.

Any insight on how to solve this error will be greatly appreciated. Thanks

  • Unless log_connections if turned on, there is no reason for new connections to get logged.
    – jjanes
    Jul 27, 2021 at 4:02
  • You have not described any errors.
    – jjanes
    Jul 27, 2021 at 4:08

1 Answer 1


You get PID 24861 in cancel request did not match any process if/when at the time you do a pg_ctl restart -m fast, you had other application(s) checking out connections to the postgres server.

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