Solution or Workaround
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'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.