Search This Blog


Network Serial Ports In VMware (Licensing Issues)

As per 5.1 Documentation it says you should be able to connect to a guest serial port by attaching a virtual serial port and using the "Use Network" option as of 5.x.

What they do not mention is that this feature only works in VMware Enterprise licenses.

I spent hours trying to figure out why my serial port would never maintain its "Connected" checkbox as shown below:

It would consistently revert and I had already confirmed that firewall was not blocking the ports:
~ # esxcli network firewall ruleset list -r remoteSerialPort
Name              Enabled
----------------  -------
remoteSerialPort     true

I have also verified that the esxi server is accepting connections to 3008 on the host:

telnet RPC-D8-03VM 3008   
Connected to      
Escape character is '^]'.                            

~ # nc -l 3008



But nothing seemed to work. Even new version of virtual hardware/different OS.

lspci wasn't showing anything even being connected to the guest.

After contacting VMware support they looked through some logs and noticed the following line stating this feature wasn't licensed:
2013-11-25T17:53:07.636Z| vmx| I120: Msg_Post: Error
2013-11-25T17:53:07.636Z| vmx| I120: [msg.serial.uri.nolicense.basic] The currently available license does not permit the use of remote serial ports.

Due to this licensing issue the VM will not even attempt to add the virtual serial port and you will not be able to telnet to your serial port or use a virtual serial port concentrator without an Enterprise license.

For future reference the log that told us that this was not a licensed feature was:

The fact that the GUI does not give any kind of notification of this functionality not working is a bit disappointing, but not more so than the functionality being licensed and not being usable.

References to others having this issue:


  1. This comment has been removed by a blog administrator.

  2. Very helpful.
    Thanks for the post as it's hard to find a straight answer to this.

    Is there any way to redirect or get this working?.

  3. well, convert this image and use on KVM. works fine.


Note: Only a member of this blog may post a comment.