Error message: GUI0023M

This error occurs when performing a system reboot.

Problem

After a reboot of the system, you receive the following error message:

GUI0023M Unable to connect to server after reboot.

If abnormal behaviors are observed which might be related to or impact Db2®, be sure to stop your Db2 instance properly before you perform a system reboot. If you do not stop Db2 properly, Db2 might take a long time to start. This will also cause IBM Spectrum® Control to not start.

Action

The Db2 instance might not have stopped properly. Manually stop and restart Db2.