421.4.3.2 service not available Telnet error


421.4.3.2 service not available while doing Telnet to relay server mostly towards HUB transport server. sometime we get below error,


to resolve this issue open the management console. go to server management, hub transport. There are two  receive connectors one is Default and other is client. on default connection go to properties and Add application IP to this. this will resolve this error.



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