Error: "A system error occurred and has been logged. Please try again later or contact your administrator." when attempting to log on with Active Directory user (4260083)

This can occur if the service account in Identity and Authentication from Active Directory is locked, or has the incorrect password.

1. Validate that the DNS server in Settings | Networking | DNS Servers can resolve the required AD SRV records

2. Ensure that the Safeguard node can communicate to Active Directory DCs and GCs over TCP/389 and TCP/3268

3. From Settings | Identity and Authentication | Double click the domain entry and validate from a "Test Connection" it is successful. 

If there is a failure ensure the following for the Service Account:
- Ensure the password set on the Service Account in Safeguard matches that of AD
- Ensure "User must change password at next logon" is unticked in the users Account properties in AD
- Ensure the account in AD is not locked or disabled
- Ensure there no "Logon Hours" restrictions in the users Account properties in AD
- Ensure "Log On To" in the users Account properties in AD is set to "All Computers"