During EEB installation, a hang is observed during the installation of the fourth EEB and the proxy log reports "Internal Server Error"
This issue occurs when the EEB installation is in-progress, and the upload operation gets triggered. This deletes some upgrade data state file and the EEB installation task is not marked done in GUI. (IA-30521)
Workaround:
After cluster configuration, when EEB installation is in-progress, do not trigger any other operation until the installation is completed.