We are experiencing an issue where logon times take 10+ minutes (or possibly fail to authenticate) when a DC on the domain is offline. It's important to note the DC doesn't belong to the AD Site that the Identity Manager appliance is serviced by based on subnet mapping so we are unsure why having the DC go down is impacting authentication via the Identity Manager portal. We have two DCs that service the site and both are online and able to authenticate clients (all other domain workstations in the site are able to authenticate successfully and I can authenticate directly to each of the DCs manually using LDP.exe as a test). When I check 'domain_krb.properties' I see the two correct DCs for the site the appliance is serviced by and neither of these DCs are the ones that are offline. Even if one were offline it is my understanding the solution would simply use the other, the whole point of having multiple - for redundancy. I enabled debug logging, gathered a log bundle from when the issue occured, and uploaded to case 19057761301. Not sure if anyone else has experienced this issue before so reaching out to the community for suggestions. It's been a week since the case was opened and I still don't even have an initial log analysis so trying to find the answer elsewhere.