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

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