When sending a job to the Geoprocessing Server from ArcToolBox, an error occurs and the following message is written into the $ARCHOME/gpserver/etc/rqmgr.log file:"Error (-9):Couldn't Start Server Task"
In order to connect to a remote processor ArcToolbox needs the username and password for the server. If the network password is changed, once the connection has been defined, sending a job to this connection will cause the error.
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