A problem and a question for the AR750S (Dynamic DNS and repair button)

Technical Support for Routers
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  1. I have a AR750S and a 300M. The AR750S is used as a VPN client and the 300M as a server. Both have remote access and have DynDNS turned on. But whenever I connect to the AR750S thru it’s glddns address, I get the 300M (servers) login screen. Same with the servers address. So both direct to the servers login page. Is this fixable?
  2. What does the repair function on the AR750S actually do?
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I have received your email to us, and I have replied to you by email

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DDNS is generated based on MAC addresses. What are the MAC addresses of your two devices.