The error “Item has already been added. Key in dictionary: ‘domain\account’ Key being added: ‘domain\account'” was preventing access to the configure managed accounts and configure service account menu’s within Central Administration, Security, General Security.
The solution is to remove one managed account using PowerShell.
$managedaccount = get-spmanagedaccount -identity “domain\user”
This will remove the extra managed account.
You may have to log out and log in again. Also recycle the application pool associated with that managed account.
I’ve found this to be very useful and gained a lot of knowledge.
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Core Solutions of Microsoft SharePoint 2013
MOC 20331B official course
This is a great course and I would thoroughly recommend it if you are looking to implement SharePoint 2013 or have already deployed it.
I did this course at QA, International House, London. The facilities were fantastic with lots of lunch venues within 5 mins away.
I have to mention the course trainer Richard Keep http://uk.linkedin.com/pub/richard-keep/22/688/856, who is one of the best trainers I have ever experienced. He has an in depth knowledge of a variety of IT platforms and solutions and delivered the course in such a way that enabled me to learn and understand whilst enjoying the material and having fun.
Passed my third and final exam in December 2012 on the road to Server 2012 MCSA.
70-412: Configuring Advanced Windows Server 2012 Services.
I am now a Microsoft Certified Solutions Associate 2012!
Passed my second exam on the road to Server 2012 MCSA.
70-411: Administering Server 2012. Scored 916 out of 1000.
Passed my first exam on the road to Server 2012 MCSA.
70-410: Installing and Configuring Server 2012. Scored 968 out of 1000.