Explanation:

The TFS 2010 web access url reported "Service Unavailable – HTTP Error 503. The service is unavailable.", but I was able to access TFS 2010 using Visual Studio IDE and other clients. Only the TFS web was not working

Solution:

Verify whether The "Microsoft Team Foundation Server Web Access Application Pool" is running. If not, start the app pool.

Exception:

'Microsoft.SharePoint.Client.ClientContext' does not contain a definition for 'Load' and no extension method 'Load' accepting a first argument of type 'Microsoft.SharePoint.Client.ClientContext' could be found (are you missing a using directive or an assembly reference)

Explantion:

I got the above exception while using 'Microsoft.SharePoint.Client.ClientContext' load method in my share point web part project. Adding Microsoft.SharePoint.Client.Runtime.dll to project assembly references resolved the errors. The reason for the load method error is as follows

• ClientContext inherits from ClientRuntimeContext
• ClientContext is defined in Microsoft.SharePoint.Client.dll
• ClientRuntimeContext is defined in Microsoft.SharePoint.Client.Runtime.dll
• ClientRuntimeContext defines the Load method

Soultion:

Add Microsoft.SharePoint.Client.Runtime.dll along with Microsoft.SharePoint.Client.dll to project assembly references.

Reference:

Exception:

Exception calling "QueryActiveRequests" with "2" argument(s): "Value cannot be null.
Parameter name: second"
At C:\Builds\Service.ps1:2 char:30
+ $tfsadmin.QueryActiveRequests <<<< ($null, "False") | %{ $_.ActiveRequests } | ft StartTime,UserName,MethodName,RemoteComputer
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

Explanation:

The following powershell script to monitor the TFS active requests work on TFS 2010 but fails with the above exception on TFS 2012.

$tfsadmin = New-WebServiceProxy –UseDefaultCredential -URI http://tfs:8080/tfs/TeamFoundation/administration/v3.0/AdministrationService.asmx?WSDL
$tfsadmin.QueryActiveRequests($null, "False") | %{ $_.ActiveRequests } | ft StartTime,UserName,MethodName,RemoteComputer

While accessing TFS 2012 server, the QueryActiveRequests web method fails to accept null value as an argument.

Workaround:

The workaround is to pass the TFS 2012 HostId as first parameter instead of $null

Following are the step to find the TFS host id

1. Open Microsoft SQL Server Management Studio

2. Connect to TFS 2012 data tier

3. Execute the below query

USE [Tfs_Configuration]
SELECT [HostId], [Name] FROM [Tfs_Configuration].[dbo].[tbl_ServiceHost] where [Name] = 'TEAM FOUNDATION'

Result
-------

HostId                                                       Name
AAAAAAAA-96A2-4BA8-A74C-11422B123456 TEAM FOUNDATION

4. Replace $null with the HostId

$tfsadmin = New-WebServiceProxy –UseDefaultCredential -URI http://tfs:8080/tfs/TeamFoundation/administration/v3.0/AdministrationService.asmx?WSDL
$tfsadmin.QueryActiveRequests("AAAAAAAA-96A2-4BA8-A74C-11422B123456","False") | %{ $_.ActiveRequests } | sort StartTime | ft StartTime,UserName,MethodName,RemoteComputer

Explanation:

System field named "Tags" column was added on the product backlog Workitem Type.

<ProductBacklog>
<Columns>
<Column refname="System.Title" width="400" />
<Column refname="System.State" width="100" />
<Column refname="Microsoft.VSTS.Scheduling.StoryPoints" width="50" />
<Column refname="Microsoft.VSTS.CMMI.RequirementType" width="50" />
<Column refname="System.IterationPath" width="200" />
<Column refname="System.Tags" width="200" />
</Columns>