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Exchnage Server DNS issues

Home Forums Microsoft Networking and Management Services DNS Exchnage Server DNS issues

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    451 4.4.0 primary target IP address responded with “421 4.4.1 connection timed out” attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts.

    I solved this issue by adding many external DNS ip’s to the Hub transport what is the wrong with my DNS ?

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