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Linked Server SS 2012(SP4) to SS 2016(SP1) just stopped working. It times out with the error "Server is not found or not accessible". However I can connect and query the target server successfully with SSMS. How can SSMS work yet Linked Server cannot even "see" the target server?

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  • How is the linked server mapping the credentials? Are they still present and working correctly on server 1. If the user on server 1 maps to a different user on server 2 can you log into server 2 using those same credentials? – KevH Jul 25 at 23:26
  • KevH, I am using the same credentials in Object Explorer which is working. The logins work if I connect via a query window, but the Linked Server cannot even "see" the target server. – Andy Jul 26 at 13:54
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    Any recent changes to firewall settings? Any DNS entry changes? Have you performed an ipconfig /flushdns command from the server having issues connecting to the linked server? – John Eisbrener Jul 26 at 15:33
  • John, Thank you for your comment. While crafting a response I realized that SSMS was connecting from my local machine (successful) while the linked server was connecting from Server A (un-successful). Now I understand the issue and know where to look. Thanks! – Andy Jul 29 at 16:40
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There is an connection issue between Server A and B, NOT local machine and Server B.

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