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ESXi 5.5 "Use physical serial port" option greyed out

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Last Modified: 2014-02-08
Hi guys,

I am trying to connect the vMA (5.5) appliance to a physical serial port on our esxi 5.5 host managed by the vSphere Essentials. When I get to "Add hardware > Device type > Select port type", the "Use physical serial port" option is greyed out.

Now I assume that this might simply be a matter of having to reboot the host with the cable attached as it was only connected when the host was already on. But a problem is that this server hosts several fairly important production machines and turning them all off would be grossly inconvenient.

I should also add that I was trying to connect the host to an APC ups this way, using the guide below:
http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/165000/FA165747/en_US/Configuring%20ESXi%20Rev%202%20Aug%202013.pdf
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DavidPresident
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Top Expert 2010

Commented:
Is that port assigned to another VM? If so, that isn't going to fly.
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Commented:
This one is on us!
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Martin AndelSenior IT Analyst

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Commented:
I figured there must have been something wrong in the BIOS settings. So I waited until weekend, rebooted the production server and found that the serial port had been disabled.

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