Event ID - 9318

Event Id9318
SourceMSExchangeMTA - Interface
DescriptionAn RPC communications error occurred. Unable to bind over RPC. Locality Table (LTAB) index: 151, NT/MTA error code: 1722. Comms error 1722, Bind error 1722, Remote Server Name SERVERNAME [MAIN BASE 1 500 %10] (14)
Event InformationAccording to Microsoft:
The MTA uses remote procedure call (RPC), a synchronous socket protocol for intrasite and site connections. The methodology that provides the bind and bind back changes in the post-Exchange Server 5.5 Service Pack 3 (SP3) build 2651.75; the Exchange Server 5.5 SP3 build of the MTA is 2650.24. In particular, build 2651.75 or later of the MTA requires fully qualified domain name (FQDN) resolution for normal operation, which is accomplished with Domain Name System (DNS) or HOSTS files.
Each Exchange Server computer must have a valid host (A) record in either a DNS or a HOSTS file with the FQDN of each Exchange Server to which the Exchange Server computer connects added to the %SystemRoot%\System32\Drivers\Etc folder. Exchange Server 5.5 Service Pack 4 (SP4) and Microsoft Exchange 2000 Server require that the TCP/IP protocol be installed on the server.
Consider a two-server scenario in which one server, ServerA, is multihomed. It is important to note that a multihomed server (a server with multiple network interfaces such as a network interface card [NIC], a MODEM card, or an Integrated Services Digital Network [ISDN] card) causes bind back errors on the server that is hosting the adjacent MTA, yet mail flow is not interrupted. This behavior is expected because ServerAs MTA successfully binds to ServerB on the network segment that is common to both the servers. While SeverA binds to ServerB, passing each available bind string in sequence, ServerB logs a bind back failure for each bind that passes a string that ServerB cannot resolve.
Reference LinksXCON: RPC Error Messages 9318 and 9322 Are Logged After You Install Post-Exchange Server 5.5 SP3 or SP4 MTA

XCON: Post-Service Pack 3 MTA Bindback String Changes

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