Verifying connection with webserver ... Failed to establish connection with webserver. Gracefully shutting down OpManager. Trying to shutdown OpManager
Reason:
Required files may not be available in the directory or the available version may be a lower version.
Resolution:
Check if libgdbm.so.2 is available under /usr/lib directory. If not, you can install the stable version of libgdmg1. Download this package from the url http://packages.debian.org/stable/libs/libgdbmg1