Can't connect to ESXi 5.1 host - (The remote server returned an error: (503) Server Unavailable.))

I'm having trouble connecting to an ESXi 5.1 host running on a ProLiant DL380p Gen8.


Ping from vCenter Server works
vCenter Server - can't connect
vSphere Client - can't connect

ESXi console directly (Remote iLO)
"Restart Management Network" - Didn't fix the issue
Troubleshooting Options> "Enable SSH" - Can't connect via SSH
Troubleshooting Options > "Restart Management Agents" - Didn't fix the issue

Troubleshooting Options > "Enable ESXi Shell" > Alt + F1 - I can't use commands in CLI - "/bin/sh: can't fork"
/bin/sh: can't fork
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GG VPConnect With a Mentor Commented:
It looks like a known issue, can you please refer the below VMware KB, and let us know if this fixes your issue,

This issue occurs with ESXi hosts running on HP hardware with these versions of AMS:
hp-ams 500.9.6.0-12.434156
hp-ams 500.10.0.0-18.434156
Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Restart your Host Server, and ensure you are using the OEM HP version of ESXi 5.1.

The issues is because of a memory leak, and there is no fix, other than restart the server and replace the drivers with updated later drivers.
Dawid FusekConnect With a Mentor Virtualization Expert, Sr B&R, Storage SpecialistCommented:
as colleges notice I also think it may be issue with HP AMS (HP Agentless Management Service) drivers, so here you have a newest one (for ESXi v5.1) with installation procedure:

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ipr0uteAuthor Commented:
Thanks for the information. I have a maintenance request pending to implement the solution. I'll post an update once complete.
ipr0uteAuthor Commented:
I have installed the new drivers this past weekend and giving it a few weeks to be 100% the issue doesn't return.
Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
good luck mate, keep us up to date.

GG VPCommented:
Thanks for updating!
ipr0uteAuthor Commented:
Issue resolved.
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