Customer starts having weird printing and media attachment issues with their main business software. We login to a couple PCs and get prompted about network discovery like it's a new network... On a domain network 💀 Primary domain controller lost a power supply and was waiting for a new one. Secondary somehow lost its secure connection between AD and DNS when updates applied. Man those were some tense moments while we waited to see if the connection re-creation worked. #SysAdminNightmares