![]() Telnet to the SMTP server fqdn failed from the Internet. In this setup SMTP server is a Hybrid server which had not opened port 25 from firewall. So Hybrid configuration wizard will configure everything for you but can’t open a port on the firewall. ![]() The last endpoint attempted was IP addressĬonnector Validation wizard try to connect to the SMTP server and send the email. Either there are no alternate hosts, or delivery failed to all alternate hosts. Winsock error code: 10061, Win32 error code: 10061.” Attempted failover to alternate host, but that did not succeed. This is simple solution be I could not find a proper blog so I am sharing the solution.Ĭonnector Validation failed and given the following error:Ĥ50 4.4.101 Proxy session setup failed on Frontend with ‘441 4.4.1 Error encountered while communicating with primary target IP address: “Failed to connect. While setting up a Hybrid Solution today, Office 365 Outbound Connector validation failed.
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