If you have a problem accessing the host externally, SSH into iDRAC and access the host console.
The console redirect to serial over SSH, use an SSH client and complete the following steps.
SSH into the iDRAC and login with the root user and iDRAC password. You will get a login similar to admin->. This indicates you are in the iDRAC SSH console.
Execute the following commands:
racadm set BIOS.SerialCommSettings.SerialComm OnConRedirAuto
racadm set BIOS.SerialCommSettings.SerialPortAddress Serial1Com2Serial2Com1
racadm jobqueue create BIOS.Setup.1-1
racadm serveraction powercycle
The iDRAC should now be configured to access serial console.
From the iDRAC SSH interface run the command below to access the serial console:
console com2
To return to the iDRAC interface and disconnect from the console, the default escape sequence is ^\ (CTRL+\) , or simply close the SSH window.