Starting SDE for Informix: errors -408 and -27001

Last Published: April 25, 2020

Solution or Workaround

** Internal Publish Only! This article may contain information that is not intended for external circulation. **

'sdemon -o start' fails. Looking at the Informix log with 'onstat -m', these errors are seen:

"10:03:01 listener-thread: err = -408: oserr = 0: errstr = :
Invalid message type received from the sqlexec process".

"10:03:22 listener-thread: err = -27001: oserr = 0: errstr =
: Read error occurred during connection attempt".


Both Informix and SDE are trying to listen on the same IP port. The port names in $SDEHOME/etc/services.sde and $INFORMIXDIR/etc/sqlhosts are the same or point to the same port.


Change one or the other to another port number. If SDE's are changed, restarting the Informix server is not required.

Article ID:000001838

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