Univention System does not update packages || Also does not provide DNS to other systems in the network

Dear All,

My Univention system does not update any packages, it’s a domain controller setup and has stopped providing DNS services to all the system in the network, possibly due to which there is no internet connection as well onto the system’s though it shows as internet connected not able to surf / access internet.

Not sure how to see where the issue lies and how to troubleshoot the issue.

Any help will be highly appreciate.

Thank you