Category Archives: VMware

Error 20003. Could not configure vCenter Single Sign-On

You may receive this error when installing vCenter Single Sign-On. You may see something similar to this in %TEMP%\vminst.log:

VMware Single Sign On-build-941610: 01/16/13 15:00:01 RunSSOCommand:: error code returned is 255 while launching C:\Program Files\VMware\Infrastructure\SSOServer\utils\rsautil.cmd
VMware Single Sign On-build-941610: 01/16/13 15:00:01 Posting error message 20003

The solution in my case was to browse to the directory where VMware was installed (default C:\Program Files\VMware\Infrastructure) and rename the JRE folder to something else. Make sure you have vCenter services stopped before attempting to rename the JRE folder. Once that’s done, install SSO. Do not worry about renaming the folder because your next step should be to install the Inventory Service and then vCenter which will replace the JRE folder.

Unable to connect to the MKS: The remote host certificate has these problems

I ran into this error when upgrading our hosts to ESXi 5.0 from 4.1u1. I used the option to format and re-install ESXi. Once the upgrade was complete, the host re-connected to vCenter successfully and all VM operations acted normal except for being able to launch the console of a VM.

MKS Error

Unable to connect to the MKS: The remote host certificate has these problems: *unable to get local issuer certificate * Host name does not match the DNS name in certificate.

The problem was the certificate chain and DNS name stored in the vCenter database was referencing the old ESXi installation rather than the new one. To solve the problem, I removed the hosts from the vCenter inventory and rejoined them to vCenter.