There is no web server in an MX2800.
You can use a serial RS-232 connection to the craft (console) port for initial configuration. From there you can configure IP on the Ethernet port to allow telnet connections to the device. Once Ethernet connectivity is established you may also be able to do some configuration via SNMP.
No GUI, however.
The telnet communication is menu-based, no CLI.
The craft (console) port has a different pinout from Cisco and just about everything else. Pinout is here: https://supportforums.adtran.com/docs/DOC-3471
From AOE/EMS you can discover the device, but you cannot manage services via Service Activator or Service Designer. It is not supported in that sense.
You do have the option of using the Show Detail Web Menu which is essentially the equivalent of the Menus available from telneting to the device.