XenServer cannot connect in XenCenter or XCP-ng Center

XenCenter error

Having problems and your XenServer cannot connect to XenCenter? Did you have high availability enabled? If you answered yes to both these questions here is how you get your XenServer back online and functioning properly.

XenServer Cannot Connect

Step-by-Step Guide

  • PuTTy into the XenServer Pool Master
  • run the following commands:

xe pool-ha-disableNote: If this fails try ha-disable force below
xe host-emergency-ha-disable force=true
xe pool-emergency-transition-to-master --force

Note: This will force the pool and slaves to reinitialize with the pool master

  • Once the server reboots it should connect
  • Go into your XenCenter and re-connect

Other Helpful Commands for troubleshooting

xe-toolstack-restart – First command I always try before anything else
service xapi restart – This restarts a core service
xsconsole – This launches console to check pool, network config, ha, running VMS, etc.

How-To Video going over troubleshooting


This will get your server back up and accessible, however, this disables high availability and will need to be set back up. It’s important to note the cause of an event like this. In my case, the SR I was using to host my VMs was not sufficient and caused the outage. If this happens to you make sure you have a good SAN/NAS for hosting on a Gigabit or above connection. I’d highly recommend a 10Gbs connection or a multipath gigabit connection at the very least.

Leave any Questions and Comments below and I will get back to you. I regularly publish on YouTube, Steemit, and christitus.com so if you’d like to see more videos and articles click the subscribe button in the top right.

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