Server Node Does Not Start

Problem

After installing or upgrading a node in the cluster, one or more server nodes do not start.

Assess the root cause and take the appropriate corrective action.

Root Cause	Assessment	Correction
The version of the server node is incompatible with the rest of the cluster.	On a server node that is not starting, review the `<SMP_HOME>`\Server\log\osgi.log for the following message: `The version of this server node (<version number>) is not compatible with the cluster you are attempting to connect to. It must be one of [<compatible version numbers>].`	Upgrade the server node to a compatible version, then start the server.
The server node did not connect to the database.	On a server node that is not starting, review the `<SMP_HOME>`\Server\log\osgi.log for the following message: `Failed to connect to the database on startup. The following error was returned: <error message>.`	Verify that the database is running and the server node can connect to it. The error message may provide more specific information about the source of the problem, such as a network outage. You can use the database logs to determine database-specific errors.
The server node key does not match the key used for the rest of the cluster. Note This problem may occur when you install a second node before the first node has been started.	On a server node that is not starting, review the `<SMP_HOME>`\Server\log\osgi.log for the following message: `The key of this server node does not match the cluster you are attempting to connect to it.`	Uninstall SAP Mobile Platform Server from the node, then reinstall it.