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Mail flow not working after changing public IP address

June 4, 2018 | by iaur | posted as Exchange Onprem, Failure

Behavior: Inbound\outbound and internal and external mail flow issue

Reason: [{LED=451 4.7.0 Temporary server error. Please try again later. PRX2 };{MSG=};{FQDN=mail.faceresionem.xyz};{IP=13.67.95.11};{LRT=6/3/2018 7:35:31 PM}]. OutboundProxyTargetIP: 13.67.95.11. OutboundProxyTargetHostName: mail.faceresionem.xyz

Solution: configured set-frontendtransportservice with the same DNS settings as the transport service

Firstly, change the DNS look up settings of ECP to the new public IP address of the DNS server(13.67.95.11 which is a variable)

Exchange admin center recipients permissions compliance management organization protection mail flow mobile public folders unified messaging servers hybrid servers databases database availability groups virtual direc Exchange Server - Exchange A https://maiI.faceresionemxyz/ecp/Servers/EditServer.aspx?pwmcid=g&Retur EXCHOI-HYB-FS EXCH general databases and database availability groups POP3 IMAp4 unified messaging DNS lookups transport limits transport logs Outlook Anywhere External DNS lookups Some Send connectors use external DNS MX resource records. Specify use of the D' configured on the network adapter or man DNS server IP address. Custom settings ADDRESS
set-FrontendTransportService EXCH01-HYB-FS -InternalDNSAdapterEnabled $false
set-FrontendTransportService EXCH01-HYB-FS -InternalDNSServers 13.67.95.11
set-FrontendTransportService EXCH01-HYB-FS -ExternalDNSAdapterEnabled $false
set-FrontendTransportService EXCH01-HYB-FS -ExternalDNSServers 13.67.95.11
Machine: EXCH01-HYB-FS.faceresionem.xyz C : NW in dows ys tem32 he t —Front end r ran sport Seru ice C : NW in dows ys tem32 he t —Front end r ran sport Seru ice EXCHOI-HYB-FS C : NW in dows ys tem32 he t —Front end r ran sport Seru ice C : NW in dows ys tem32 he t —Front end r ran sport Seru ice EXCHOI-HYB-FS EXCHOI-HYB EXCHOI-HYB —FS —FS —ExternalDNSRdapterEnabIed $FaIse -ExternalDNSSeruers 13.6?.95.11 —InternalDNSRdapterEnabIed $FaIse -InternalDNSSeruers 13.6?.95.11 stem32>

Restart the FF. Services:

Microsoft Exchange Frontend Transport

Microsoft Exchange Transport

Checked Domain Type via accepted domain

TO check:

get-FrontendTransportService | select ExternalDNSAdapterEnabled,InternalDNSAdapterEnabled,ExternalDNSServers,InternalDNSServers
Machine: EXCH01-HYB-FS.faceresionem.xyz C : NW in dows ys tem32 ran sport Seru ice a IDNSSeruers InternalDNSSeruers • select ExternalDNSRdapterEnabIed. InternalDNSR Externa IDNSRdapterEnabIed False I n ternaIDNSRdapterEnabIed False ExternalDNSSeruers InternalDNSS

https://social.technet.microsoft.com/Forums/ie/en-US/fc26dac5-d4e2-49da-903d-361ea8b85388/451-470-temporary-server-error-please-try-again-later-prx5?forum=exchangesvrgeneral