Exchange 2013: Remote host said: 451 4.7.0 Temporary server error. Please try again later. PRX2

Today I met a strange issue in Exchange 2013 new installation.

Incoming emails were not arrived at the mailboxes. The NDR shows “Remote host said: 451 4.7.0 Temporary server error. Please try again later. PRX2”

I checked everything on the DNS side and no joy !!!

The server used were a multi-role server and found as this is a bug in the program.

The fixย is:

1. Create host file entries on the server with two names: server,server.domain.localย 

2. Restart “Microsoft Frontend Transport” and “Microsoft Exchange Transport” services

After doing the procedure, inbound emails has been arrived suddenly !!!

Hope this will help you if you met issues in Exchange 2013 Multi-role server infrastructure

14 thoughts on “Exchange 2013: Remote host said: 451 4.7.0 Temporary server error. Please try again later. PRX2

  1. Pingback: TechNet Blogs

    • My server has been up for awhile and just started having this issue, started dropping some emails while delivering others. my server is now going strong for 2 hours without deferring any. Thanks!!

  2. I have the same Problem please help meh.
    I write in de Windows\system32\Drivers\etc. the host file entries with ip address
    but it doesnt work.

  3. I have just installed Exchange 2013 cu5 and got this same error on a server with two nics.

    Adding entries to the Exchange server’s host file as described above cured the problem for me.
    E.G. (tab)
    and (tab)

    FYI for noobs: hosts file is usually located in C:\Windows\System32\drivers\etc
    Open notepad with Admin rights (to allow saving of new entries) and browse to above location.

  4. Hi,
    Check the backend/frontend receivers .. backend = 2525, frontend 25…
    I you use them the wrong way you will take down you server ๐Ÿ™‚

  5. Pingback: Blog Posts of the Week (10th – 16th November 2013) | India MVP Community

  6. Thank you very much this also worked for me, when you make the change, if nothing happen straight away you may have to bounce/reboot server, after that the emails will just flow in like water

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