exchange 2010 server

Our exchange 2010 server can't get external email. Internal outcoming /incoming is working fine.
I did restart Transport Service in exchange server - not working.
I did run dcdiag.exe on our AD server 2012 - all passes except below:

Starting test: Replications
         [Replications Check,ADS-01] A recent replication attempt failed:
          From VMS-DC1 to ADS-01
          Naming Context: DC=BFServer,DC=local
            The replication generated an error (1256):
            The remote system is not available. For information about network troubleshooting, see Windows Help.            
            The failure occurred at 2016-09-27 00:50:43.
            The last success occurred at 2016-02-10 05:49:02.
            5519 failures have occurred since the last success.

Overall, what else I can try? It does not look like Replication error is the cause of the email issue.

Thanks,
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ITsolutionWizardAsked:
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IvanConnect With a Mentor System EngineerCommented:
Hi,

there it is.
As said in post above, I asked if there are some errors in event, regarding back pressure :)

You have to delete some data from that disk, to allow mail to flow again. I would not recommend to disable that check.

If you really, really, want to disable that check, then you need to reconfigure file EdgeTransport.exe.config file, which is located at C:\Program Files\Microsoft\Exchange Server\V14\Bin

Open file with notepad, and change value for disk space.

More on back pressure can be found here:
http://exchangeserverpro.com/exchange-transport-server-back-pressure/
https://technet.microsoft.com/en-us/library/bb201658(v=exchg.141).aspx 

Regards,
Ivan.
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IvanSystem EngineerCommented:
Hi,

when you say "can't get external email", that means you cannot send email to external email, and cannot receive external email as well?

When you look at email queue on Exchange, does it fill more and more? If so, there should be some message in queue window telling you reason why it cannot send email. Post error if there is some.

Maybe there is lack of resources in Exchange, which is causing back pressure. How much RAM is used, and how much HDD space free. In %.

Take a look at event viewer, in Application events. If there is a back pressure,  there will be error, with code 1500x. If so, post error.

Do you get some NDR when you try to send email?
Does email just sit in Outbox of Outlook?

Regards,
Ivan.
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IvanSystem EngineerCommented:
Btw, that replication is telling that there was no successful replication from February?
Are those 2 DC up and running?
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ITsolutionWizardAuthor Commented:
The event logs say "The MS Mail submission service is currently unable to contact any hub transport server in the local Active Directory site. The servers may be too busy to accept new connections at this time.".

I did check our Active Directory server. and does seem to have any issues....what you suggest me to check?
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ITsolutionWizardAuthor Commented:
you mean VMS-DC1?
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IvanSystem EngineerCommented:
From VMS-DC1 to ADS-01

Those 2 DC are up and running?
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ITsolutionWizardAuthor Commented:
Yes
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IvanSystem EngineerCommented:
Can you check Microsoft Exchange Mail Submission service. Is it running and under which account is it running.
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ITsolutionWizardAuthor Commented:
It is running. but i do not know how to check which account
Issue2.jpg
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IvanSystem EngineerCommented:
Hi,

it is running under local system account.

Is this server running some other services beside exchange? Do you have some AV? Can you try to stop them, then restart transport service again, to see if that will help.

Btw, since your external mail flow is not working, I would consider restarting Microsoft Exchange Active Directory Topology service (which is going to restart few other exchange services), or even entire server, since it is not much useful right now.
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ITsolutionWizardAuthor Commented:
What is AV?
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IvanSystem EngineerCommented:
Antivirus.
Did you do some firewall reconfiguration?

Try to disable antivirus, restart transport service and see if mail is going.
If not, and there were some firewall reconfiguration, you can try to disable firewall, and see if that helps.

If nothing helps, as per above post, I would restart Microsoft Exchange Active Directory Topology service or entire server.
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ITsolutionWizardAuthor Commented:
Microsoft Exchange Active Directory Topology & entire server reboot tried - still not working
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ITsolutionWizardAuthor Commented:
after i restarted Microsoft Exchange Active Directory Topology,
and get attached alert.

it may be because low disk space? I am not sure. how can i disable this check?
I just do not want to remove the files. I am not sure which one i can remove
Issue4a.jpg
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ITsolutionWizardAuthor Commented:
The only thing I want to say is: You are the man....!!!! Issue Resolved. Thank you for your helps.
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IvanSystem EngineerCommented:
How large is the hard drive C:\ and how much space is there on it?

Database queue is located at:
C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\data\Queue

Maybe you can delete some files from TEMP folder, or some installation files?
It seams that C drive is consumed more then 95%, so it has less then 5% of free space.

Bottom line is, that your C drive is gon'a get filled soon, so I would advise to:
1. Delete TEMP and any installation files located on C drive.
2. Use Tree size free to see what is using a lot of space, maybe it can help
     https://www.jam-software.com/treesize_free/
3. If Exchange is VM, maybe you can expand it's drive?
4. If it is not, then move queue database to some other drive, if you have any other drive?

To move database queue to new disk:
https://technet.microsoft.com/en-us/library/bb125177(v=exchg.141).aspx
OR
https://theucguy.net/moving-transport-queue-in-exchange-2010/

Regards,
Ivan.
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IvanSystem EngineerCommented:
Thank you :)
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ITsolutionWizardAuthor Commented:
I am actually very worry to delete files. Can you give me head up what I can delete and it won't absolutely hurt the server?

Thanks
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IvanSystem EngineerCommented:
Well,

IIS log files. They can use a lot of space. They should be located in C:\inetpub\logs\LogFiles

In there, you should find folders with names W3SVC1, W3SVC2, and so on. You can copy/ paste those files to your computer, or somewhere else, and delete them. They are used for SMTP tracking, so not a problem if you delete them. Deleting them will not affect server work.

Beside that.. I would recommend only to delete user created files and temp folder conntent (C:\temp).
Download that tree size program, and it will tell you what is using drive space.

Regards,
Ivan.
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