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Users intermittently observe a 403 error on the interface.
An error of the following type is observed in the <JBoss_home>standalone\log\server.log at the same time:
<JBoss_home>standalone\log\server.log
[Appian Work Item - 341 - ProcessExec00 : CatchupRequest] ERROR com.appiancorp.process.engine.CatchupRequest - Failed to register catchup (0), can retryINFO [stdout] (Appian Work Item - 341 - ProcessExec00 : CatchupRequest) com.appiancorp.kougar.driver.exceptions.Signal: Cannot call itselfINFO [stdout] (Appian Work Item - 341 - ProcessExec00 : CatchupRequest) at com.appiancorp.kougar.driver.ipc.IpcConnection.get(IpcConnection.java:390)
<Appian_home>\logs\db_PX** logs, have an error of the following type:
<Appian_home>\logs\db_PX**
[PX011] {pe975.kdb ,1548295} (Default) WARN .a.p.PROCESS.i "Incremental Update: Exec Engine is not ready to start Incremental update.
The errors indicate that there was an issue with the engine migration. It's possible that the engines were not shutdown gracefully before migrating them.
Perform the migration again as documented here and make sure the engines are stopped gracefully on the original environment.
This article applies to all versions of Appian.
Last Reviewed: August 2018