Configurations for proxy settings and digest authentication can be made in Global Settings >> Miscellaneous Settings:

Tick the Enable Proxy check box and provide the proxy details. Proxy authentication can be enabled and a further option of using digest authentication is also available if required.

It is required to reload ADSS Server configurations from the Server Manager module whenever changes are performed in the proxy settings.

See also

CRL Monitor Key Features
CRL Storage within ADSS Server

Using the Service Manager
High Availability for CRL Monitor
Viewing CRL Details
CRL Monitoring
Instant Revocation
CRL Logs
Logs Archiving
Alerts
Management Reporting