Delivery fails: "The server response was: 4.7.0 Temporary server error. Please try again later. PRX3"

Trying to setup an Exchange 2013 server, with the DC and Exchange on same machine. WHen I try to deliver for either of the 2 mailboxes I have setup, I get this error.
The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
It doesn't seem to be a resource issue (I'm running an XL instance on Azure), and all other connectivity works fine (and fast). I just can't receive email there.
Looking in the event logs, I saw one issue related to the Front End HTTP proxy, but I wouldn't assume that's relevant here. (And connectivity via Outlook & OWA seem to be fine, with the exception
of some redirect issues on the latter).
I did end up installing Exchange on a secondary drive for space considerations, so the location is different... not sure if that would factor in either.
Any ideas? I don't even really know where to start debugging this. I'm trying to set this up to work on some event sync/forwarding code.

Ok, I think I solved my problem but figured I would update here for others who may be running into the same issue.
In my \Exchange\TransportRoles\Logs\FrontEnd\ProtocolLog\SmtpReceive\*.LOG, I found more detailed information on the issue.
"Message or connection acked with status Retry and response
451 4.4.0 Error encountered while communicating with primary target IP address: ""421 4.2.1 Unable to connect.""
Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 10.10.10.1:2525"
I thought creating an endpoint for 25 would be sufficient, but once I created another endpoint for 2525 then my tests started working.

Similar Messages

The server response was: 4.7.0 Temporary server error. Please try again later. PRX3

Hello,
I just setup an exchange 2013 server with hosted with the same machine of Active Domain Controller.
I tested the connectivity of the server , i found that the mailbox can only send email to external mailbox however it cant receive any mail neither from external mail nor internal mail.
I ran a test from exchange connectivity analyzer for inbound mail and it failed with the following message.
The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
I did a search on this forum and found the following thread
social.technet.microsoft.com/Forums/exchange/en-US/288e1619-ce56-4c3a-8bb1-4886835520fe/delivery-fails-the-server-response-was-470-temporary-server-error-please-try-again-later?forum=exchangesvrdeploy
but no luck , i dont know how to set an alternative host, would somebody please help.
error details:
Message: Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
Exception details:
Message: Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
Elapsed Time: 3107 ms.
The server returned status code 451 - Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
Exception details:
Message: Error in processing. The server response was: 4.7.0 Temporary server error. Please try again later. PRX3
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
at System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()
Elapsed Time: 3107 ms.

Thanks god, finally i found the solution :) , i can go to sleep
i added my ad domain name to the host table then all the problems are solved!!!
source
http://www.techieshelp.com/exchange-2013-451-4-7-0-temporary-server-error-please-try-again-later-prx5/

(Cisco Historical Reporting / HRC ) All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054

Hi All,
I am getting an error message "All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054" when trying to log into HRC (This user has the reporting capabilities) . I checked the log files this is what i found out
The log file stated that there were ongoing connections of HRC with the CCX (I am sure there isn't any active login to HRC)
|| When you tried to login the following error was being displayed because the maximum number of connections were reached for the server . We can see that a total number of 5 connections have been configured . ||
1: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:Current number of connections (5) from historical Clients/Scheduler to 'CRA_DATABASE' database exceeded the maximum number of possible connections (5).Check with your administrator about changing this limit on server (wfengine.properties), however this might impact server performance.
|| Below we can see all 5 connections being used up . ||
2: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:[DB Connections From Clients (count=5)]|[(#1) 'username'='uccxhrc','hostname'='3SK5FS1.ucsfmedicalcenter.org']|[(#2) 'username'='uccxhrc','hostname'='PFS-HHXDGX1.ucsfmedicalcenter.org']|[(#3) 'username'='uccxhrc','hostname'='PFS-HHXDGX1.ucsfmedicalcenter.org']|[(#4) 'username'='uccxhrc','hostname'='PFS-HHXDGX1.ucsfmedicalcenter.org']|[(#5) 'username'='uccxhrc','hostname'='47BMMM1.ucsfmedicalcenter.org']
|| Once the maximum number of connection was reached it threw an error . ||
3: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:Number of max connection to 'CRA_DATABASE' database was reached! Connection could not be established.
4: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:Database connection to 'CRA_DATABASE' failed due to (All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054.)
Current exact UCCX Version 9.0.2.11001-24
Current CUCM Version 8.6.2.23900-10
Business impact Not Critical
Exact error message All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054
What is the OS version of the PC you are running and is it physical machine or virtual machine that is running the HRC client ..
OS Version Windows 7 Home Premium 64 bit and it’s a physical machine.
. The Max DB Connections for Report Client Sessions is set to 5 for each servers (There are two servers). The no of HR Sessions is set to 10.
I wanted to know if there is a way to find the HRC sessions active now and terminate the one or more or all of that sessions from the server end ?

We have had this "PRX5" problem with Exchange 2013 since the RTM version. We recently applied CU3, and it did not correct the problem. We have seen this problem on every Exchange 2013 we manage. They are all installations where all roles
are installed on the same Windows server, and in our case, they are all Windows virtual machines using Windows 2012 Hyper-V.
We have tried all the "this fixed it for me" solutions regarding DNS, network cards, host file entries and so forth. None of those "solutions" made any difference whatsoever. The occurrence of the temporary error PRX5 seems totally random.
About 2 out of 20 incoming mail test by Microsoft Connectivity Analyzer fail with this PRX5 error.
Most people don't ever notice the issue because remote mail servers retry the connection later. However, telephone voice mail systems that forward voice message files to email, or other such applications such as your scanner, often don't retry and
simply fail. Our phone system actually disables all further attempts to send voice mail to a particular user if the PRX5 error is returned when the email is sent by the phone system.
Is Microsoft totally oblivious to this problem?
PRX5 is a serious issue that needs an Exchange team resolution, or at least an acknowledgement that the problem actually does exist and has negative consequences for proper mail flow.
JSB

451 4.7.0 temporary server error. please try again later. prx4

Hello,
in my environment i can send/receive mail.
When doing some checks i will end up with this error :
451 4.7.0 temporary server error. please try again later. prx4
I have tried the following without results :
Exchange 2013 SMTP error "451 4.7.0 Temporary server error. Please try again later. PRX3"
This error message seems to be caused by DNS issues in the Exchange 2013 set up. Exchange then rejects all emails like this. It is not quite clear what Microsoft means with this error code and the various PRX-numbers at the end - we've also seen PRX1, PRX3,
PRX7. There is no list and no documentation on them available.
From customer feedback we found these ways to solve the problem:
Disable all unused network cards.
Check all DNS server entries in the configuration of your network cards (check
all network adapters) and make sure not to reference server 127.0.0.1 as DNS server but to use the real IP address instead.
If you have more than one fixed IP address in the server add an entry for each IP address in the hosts file (C:\Windows\System32\drivers\etc\hosts) formatted like "192.168.1.1 SERVERNAME".
Important: Do load the latest Exchange 2013 updates, especially CU1 if you haven't done that already.
Please delete the receive connectors in Exchange and create one new receive connector. Use the "front end" instead of "hub transport" setting and vice versa.
What do do, to fix this issue?
Thx

Hello,
Please use dcdiag command to check if all DC run normally.
Please use repadmin /showrepl command to verify DC replication status.
Please check if there is any related error in application log.
Cara Chen
TechNet Community Support

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I need to clear this things.

regarding of the game that I playing, its Dragonvale, I plan to buy a Gem. and after I desided to buy, but what happen is that the game centre it self didnt gave me the Gem but instead they said "Connection Error. The Game server had an internal error. Please try again later."
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Microsoft Windows 7 x64 Home Premium Edition Service Pack 1 (Build 7601)
Sony Corporation VGN-NW225F
iTunes 11.1.1.11
QuickTime not available
FairPlay 2.5.16
Apple Application Support 2.3.6
iPod Updater Library 11.1f5
CD Driver 2.2.3.0
CD Driver DLL 2.1.3.1
Apple Mobile Device 7.0.0.117
Apple Mobile Device Driver 1.64.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.6.502
Gracenote MusicID 1.9.6.115
Gracenote Submit 1.9.6.143
Gracenote DSP 1.9.6.45
iTunes Serial Number 0036BCE80A4B11B0
Current user is an administrator.
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iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is supported.
Core Media is supported.
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Intel Corporation, Mobile Intel(R) 4 Series Express Chipset Family
Intel Corporation, Mobile Intel(R) 4 Series Express Chipset Family
**** External Plug-ins Information ****
No external plug-ins installed.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:        {12A6B503-5D6E-4C9D-9E63-F4DD82122E2B}
Description:            Atheros AR9285 Wireless Network Adapter
IP Address:             *.*.*.*
Subnet Mask:          255.255.255.0
Default Gateway:    192.168.2.1
DHCP Enabled:      Yes
DHCP Server:         192.168.2.1
Lease Obtained:     Sun Oct 06 01:28:03 2013
Lease Expires:       Sun Oct 06 01:28:02 2013
DNS Servers:         192.168.2.1
Adapter Name:        {0392DEE3-4F2A-4EED-8133-34D4E6248495}
Description:            Marvell Yukon 88E8057 PCI-E Gigabit Ethernet Controller
IP Address:             0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:    0.0.0.0
DHCP Enabled:      Yes
DHCP Server:
Lease Obtained:     Thu Jan 01 05:30:00 1970
Lease Expires:       Thu Jan 01 05:30:00 1970
DNS Servers:
Active Connection: LAN Connection
Connected:             Yes
Online:                    Yes
Using Modem:        No
Using LAN:             Yes
Using Proxy:           No
Firewall Information
Windows Firewall is off.
Connection attempt to Apple web site was successful.
Connection attempt to browsing iTunes Store was unsuccessful.
The network connection timed out.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was unsuccessful.
The network connection timed out.
Connection attempt to firmware update server was unsuccessful.
The network connection timed out.
Connection attempt to Gracenote server was successful.
The network connection timed out.
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**** CD/DVD Drive Tests ****
LowerFilters: PxHlpa64 (2.0.0.0),
UpperFilters: GEARAspiWDM (2.2.3.0),
G: Optiarc DVD RW AD-7700S, Rev 1.70
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iPodService 11.1.1.11 (x64) is currently running.
iTunesHelper 11.1.1.11 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
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Intel(R) ICH9 Family USB Universal Host Controller - 2935. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2936. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2937. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2938. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2939. Device is working properly.
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Ricoh 1394 OHCI Compliant Host Controller. Device is working properly.
**** Device Sync Tests ****
No iPod, iPhone, or iPad found.

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Exchange 2013 "451 4.7.0 Temporary server error. Please try again later. PRX5" Error

I know this error message is discussed on other topics on several different forums including TechNet but I ended up opening this as the suggestions that solved the problems with the previous threads dos not work on mine.
We have a ticketing software that runs on client computers which sends mails to local Exchange server for notifications using port 25.
Approximately 1 out of 5 mails end up getting the "451 4.7.0 Temporary server error. Please try again later. PRX5" error. I have confirmed this by running Wireshark on the clients, saw the exact error message. This has been replicated with
several client machines running Win7 & 8.
I have tried several solutions to this, one of them being this:
http://www.techieshelp.com/exchange-2013-451-4-7-0-temporary-server-error-please-try-again-later-prx5/
I still get the same error from time to time after doing this, so it is not the issue. All the records in local hosts file, receive connector is listening to port 25 on all IPv4 addresses.
The server has a single NIC and the DNS lookups are done through that single NIC, not through "All available adapters" as set by default on ECP.
Almost everyone seems to be convinced that this is related to DNS but looking at how fast I get the error message, it doesn't look like it's waiting for a timeout (maybe unrelated, just an observation). Do you think it is possible that the DNS servers themselves
are causing this issue?
Also, I see Event 5504 on the primary dns server almost all of them coming from the mail server, saying that the DNS query was invalid. It may be related.
Additional Notes:
- CU6 is applied but did not fix the issue.
- None of these have solved it for me: http://www.servolutions.com/support/articles/Temporaryservererror2013.htm
- Receive Connectors do listen to separate ports 25 & 2525 -> There is a single instance of both Transport Service and Edge Transport service respectively. Anonymous users are accepted in both Receive connectors.

Thank you for your post.
This is a quick note to let you know that we are performing research on this issue.
Niko Cheng
TechNet Community Support
Thank you Niko. I'm looking forward to your answer as I've gone through every post regarding this and none of them worked. I will let everyone know if I can find a solution to this.

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error 3194
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Delivery fails: "The server response was: 4.7.0 Temporary server error. Please try again later. PRX3"

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