VMware has released an updated version of vCenter Server, v5.1.0b. You can find the whole readme here. According to the readme, vCenter Server 5.1.0b is not a patch release. For more information you can find the release notes here. The release notes are particularly enlightening, as you can find all of the fixed bugs. If you have tried to install vCenter 5.1.0a and ran into problems, then give 5.1.0b a try and see how it goes.
Two important bug fixes are in 5.1.0b, which I’ve personally encountered:
vCenter Single Sign On installation fails with error 20020
vCenter Single Sign On installation fails with the following error when you select the destination folder to install the software:
Error 20020. Failed to update values in server.xml file
This issue occurs when you attempt to install vCenter Single Sign On on a folder with spaces, for which no short name exists. To verify this, run the dir /x command in the parent folder of the folder with spaces.
This issue is resolved in this release
Installation of vCenter Single Sign On fails if the database name contains a hyphen
When the Microsoft SQL Server database name contains a hyphen, (for example SSO-DB), vCenter Single Sign On installation fails with the following error:
Error 29114.Cannot connect to DB
This issue is resolved in this release.
vSphere 5.1 Install Series
If you want a full guide to installing vSphere 5.1, check out my 15-part installation guide which walks you through the whole process.