What would you like to try?
A real trouble ticket in a simulated company network. No account, nothing is stored – you can start over at any time.
5 labs for free without an account – pick one:
Hostnames are not resolvingA workstation reaches servers by IP address but not by hostname. Find out why name resolution fails.Beginner Windows · ~10 minNo access to other subnetsA workstation reaches devices in its own network, but neither the server network nor the internet.Beginner Linux · ~12 minEmployee can no longer sign inAn account keeps getting locked even though the user enters her password correctly. Find the source of the failed attempts and unlock the account.Beginner Windows · ~10 minNightly backup has not run for daysThe backup cron job on files01 starts every night, but no archive is created.Beginner Linux · ~8 minIntranet reports “certificate expired”Since this morning every browser warns about the intranet. The new certificate from the internal CA is ready but not yet in use.Intermediate Linux · ~12 min
In the lab you can switch between terminal, desktop and split view at any time.