Check DNS

Accessing AD FS should point directly to one of the AD FS servers or the load balancer in front of the AD FS servers. Do the following checks:

  • Ping the federation service name (e.g. fs.contoso.com). Confirm if the IP address that you get resolves to one of the AD FS servers or the load balancer of the AD FS servers.

  • Check if there is an A record for the federation service in the DNS server. The A record should point to one of the AD FS servers or to the load balancer of the AD FS servers.

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