When attempting to launch the query builder when creating a new Content Source or Result Source via Central Admin you receive an error as follows:

0jhmymError: Not able to connect to search service to retrieve valid settings.

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Solution
You need administrator rights to the Search Service Application – even if you are a farm administrator. (I just recently encountered this issue but thought it worked before – I am thinking that recent patches and updates plugged a security hole).

Solution Implementation – PowerShell
You can solve this easily by running the following PowerShell script with your account name:

$principal = New-SPClaimsPrincipal “DOMAIN\USERNAME” -IdentityType WindowsSamAccountName
$spapp = Get-SPEnterpriseSearchServiceApplication
$security = Get-SPServiceApplicationSecurity $spapp –Admin
Grant-SPObjectSecurity $security $principal “Full Control”
Set-SPServiceApplicationSecurity $spapp $security –Admin

Solution Implementation – Central Admin
You may also solve this via Central Admin. From Application Management, click on the Manage service applications link under the Service Applications section:

1vbertScroll down to your Search Service Application and select it:
2dfvetOn the SERVICE APPLICATIONS top ribbon, click the Administrators button:

3fbetrbIn the Administrators dialog, enter the account that needs permissions and click the Add button:

4btrjyuSelect the account in the list and grant Full Control:

5gnyujkuClick OK. The Query Builder dialog will now launch properly without any trouble.

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