Yes, this is after receiving the email. Logging in from another IP produces the same results.
Here's the output of service 3CXPhoneSystemMC01 status
● 3CXPhoneSystemMC01.service - 3CX PhoneSystem 01 Management Console
Loaded: loaded (/lib/systemd/system/3CXPhoneSystemMC01.service; enabled)
Active: active (running) since Thu 2018-03-29 13:52:55 AEDT; 5h 0min ago
Process: 1989 ExecStopPost=/bin/rm -f /var/run/phonesystem/management_console01.socket (code=exited, status=0/SUCCESS)
Process: 1986 ExecStopPost=/bin/rm -f /var/run/phonesystem/3CXPhoneSystemMC01.pid (code=exited, status=0/SUCCESS)
Main PID: 2024 (ManagementConso)
CGroup: /system.slice/3CXPhoneSystemMC01.service
└─2024 /usr/lib/3cxpbx/ManagementConsoleJS --pid /var/run/phonesystem/3CXPhoneSystemMC01.pid -p /...
Mar 29 13:52:55 3cx01 systemd[1]: Started 3CX PhoneSystem 01 Management Console.
Here's the contents of /var/run/phonesystem/
root@3cx01:/var/run/phonesystem# ls
3CXAudioProvider01.pid 3CXIVR01.pid 3CXPhoneSystemMC01.pid 3CXTunnel01.pid
3CXCfgServ01.pid 3CXMediaServer.pid 3CXQueueManager01.pid management_console01.socket
3CXEventNotificationManager.pid 3CXPhoneSystem01.pid 3CXSystemService01.pid