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How to get the DNS API permissions in CLR assembly

07 October,2014 by Tom Collins

 Question: I’m getting an error on a CLR assembly , such as :


System.Net.Sockets.SocketException: The requested name is valid, but no data of the requested type was found


How can I fix this error?


Answer: Two things you need to consider on fixing this issue

1)    Do you have the CLR assembly catalogued as PERMISSION_SET = EXTERNAL_ACCESS ?  You can can use UNSAFE , but at minimum EXTERNAL_ACCESS is required.

2)    Access is in the security context of the SQL Server service account. There is a situation where you could be impersonating the CLR procedure user. Check to see if the it’s set as Local System, you may discover there are not enough permissions to to access the DNS api

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Author: Tom Collins (


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