VMware vCenter 5.1 Update 1 was released a few days ago with a number of great enhancements and fixes. Unfortunately there was also an issue discovered. In some circumstances if you have an admin user account with more than 19 groups assigned within AD you would be prevented from logging into the web client. VMware has released an alert article on the VMware Support Insider Blog – ALERT: Login issue after updating to vCenter 5.1 Update 1 and it urges you to check KB 2050941 (Cannot log in to vCenter Server using the domain username/password credentials via the vSphere Web Client/vSphere Client after upgrading to vCenter Server 5.1 Update 1) for further information and for updates. This has been fixed in vCenter 5.1 Update 1A. Read on for further details.

I expect that this issue will be fixed fairly rapidly and then everyone will be able to upgrade to get all of the benefits included in the vCenter 5.1 Update 1 release. Keep an update on the KB for details. I would also recommend that you review Derek Seaman‘s blog article (VMware vSphere 5.1 Update 1..is it for you?) on the 5.1 Update 1 release and the other product releases that are related. He’s done a great job of giving a high level overview of all the different components that have been recently updated. Once the issue is resolved I will let you know via this blog and also give you a rundown on the highlights from a business critical applications perspective. Note: VMware is currently recommending that customers with SSO configured with multiple domain-based identity sources along with vCenter Server domain user accounts that are associated with a large number of groups (>19) should not upgrade to vCenter Server 5.1 Update 1. Customers should upgrade to vCenter 5.1 Update 1A instead. 

vCenter 5.1 Update 1A became available on 22nd May 2013 PST and addresses a number of defects in addition to the login problem that was discovered in vCenter 5.1 Update 1.

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This post first appeared on the Long White Virtual Clouds blog at longwhiteclouds.com, by Michael Webster +. Copyright © 2013 – IT Solutions 2000 Ltd and Michael Webster +. All rights reserved. Not to be reproduced for commercial purposes without written permission.