During an Appian upgrade, the application server is unable to start and the following error appears on the application server log:
ERROR com.appiancorp.kougar.driver.ipc.IpcConnection - Unexpected exception while handling message for personalization (localhost:5012)
com.appiancorp.kougar.driver.exceptions.TcpException: java.io.EOFException: Socket returned no more data at end of stream
com.appiancorp.kougar.driver.exceptions.SafeRetryException: Unable to acquire a Read connection. Safe to retry.
... 71 more
In the service_manager.log file located at <APPIAN_HOME>/logs/, the following warning is present:
com.appian.komodo.gateway.handler.codec.SecurityTokenDecoder - Invalid Security Token.
This error appears when the security token has been modified or deleted during the upgrade. In particular, it happens when the security token has been changed after starting Service Manager, causing the engines to refuse the connection with the application server. The following documentation provides additional details about the security token.
This article applies to all versions of Appian.
Last Reviewed: December 2018
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