Timed waiting for vpxa to start – VMware vSphere 5.x Error

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“Timed waiting for vpxa to start” is an error message you may receive when trying to add a VMware vSphere 5.1 ESXi host to a vSphere vCenter Server 5.0/5.0 U1  environment. 

Timed waiting for vpxa to start[5]

There are a couple of reasons for this particular error message:

1. One or more of the VMs on the ESXi host are running with a large number of snapshots.  Reminder: the maximum is 32.  See this VMware Knowledge Base for more details.  

2.  The second possible reason for the error message is that ESXi 5.1 hosts can only connect to VMware vCenter Server 5.1 instances, this can be confirmed in the VMware Product Interoperability Matrixes which can be found here.  As you can see, from the matrix a VMware ESXi 5.1 host is not compatible with anything but VMware vCenter Server 5.1.  So, if you want to add your ESXi 5.1 host(s) into a vCenter Server instance then you can either plan to upgrade your vCenter Server instance to 5.1 or downgrade to the ESXi host to 5.0 U1 or earlier.

VMware vSphere 5.1 timed waiting for vpxa to start

Either way bookmark the VMware Product Interoperability Matrixes page as it is a useful resource and can remove the need for any VMware versioning compatibility guesswork.

Also, if you are only dealing with ESXi 5.0 and vCenter Server 5.0 (ie: no ESXi 5.1 host(s) involved) and are experiencing this error then take a look at this VMware Knowledge Base article here.

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About Simon Seagrave

Simon is a UK based Virtualization, Cloud & IT Technology Evangelist working as a Senior Technology Consultant and vSpecialist for EMC. He loves working in the ever changing IT industry & spends most of his time working with Virtualization, Cloud & other Enterprise IT based technologies, in particular VMware, EMC and HP products.

As well as on this site, you can find him on Twitter and Google+


  1. Eric Gillette says:

    Was racking my brain over this one. . .looks like I need to upgrade vCenter or downgrade ESX on the one host machine. ;-) Thanks for this!

  2. Server Ninja says:

    Thanks for this post I was scratching my head over here for a minute. I am creating a lab and have all sorts of versions of ISO’s. I should have known this from the start ! Thanks for page I have book marked and will have it for reference.

  3. MagiCity says:

    Simon, Thank you VERY much for this post. I’ve been attempting to add a 5.5 host to a 5.0 vCenter Server environment. The new host has no snapshots (or guest images) so your post was the key. Downgrading to 5.1 and upgrading vCenter to 5.1.

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