vCenter 5.1 Timed waiting for vpxa to start

Recently, i installed vCenter 5.1 in Lab and tried to connect ESXi host with vCenter but got an error “A general system error occurred. Timed waiting for vpxa to start.”

I restarted Network Management Agents and re-initiated the host connection again but no luck. Thereafter, i found that ESXi 5.5 hosts can connect to VMware vCenter Server version 5.5 and above versions.

You can check VMware Product Interoperability Matrixes for compatibility check.
http://partnerweb.vmware.com/comp_guide2/sim/interop_matrix.php

Note: There might be other reasons as well which could throw the above error. But in my case, changing the version has fixed the issue.
Hope this helps!!

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