Solved

ISA 2006 publishing Exchange

Posted on 2008-06-16
11
391 Views
Last Modified: 2008-11-17
If I have an Exchange server and it is temporarily down, any SMTP server trying to send mail to it will not be able to connect and will hence do retries. What will happen if I publish this Exchange server through an ISA and the Exchange is taken down for maintenance? Will ISA inform the SMTP servers trying to send mail to the Exchange server that it is down so they will retry?
0
Comment
Question by:peakpeak
  • 6
  • 4
11 Comments
 
LVL 6

Expert Comment

by:Nyah247
ID: 21794011
I don't believe ISA will actually "inform" the servers attempting to connect.  The SMTP connection will just simply fail and the connecting servers will re-attempt according to their configuration.
0
 
LVL 28

Author Comment

by:peakpeak
ID: 21794879
Ok, what I'm aiming at is that no mail will be lost if the Exchange server is down but ISA is handling the connection. Your reasoning is in line with mine but I'd like a more precise answer.
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21794942
Mail will be eventually lost if Exchange is down for a prolonged period of time.  ISA does receive and hold the email until Exchange is back online.  

Typically connecting mail servers will send a delay message to the sender then re-attempt a connection after a set time.  If it still cannot connect after the configured time (usually 24-48 hrs) the sending server will discard the message and send an NDR.
0
 
LVL 28

Author Comment

by:peakpeak
ID: 21794983
You mean that the ISA has a mail queue? I don't believe that
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21794991
If you want true failover you will have to setup an additional mail server then configure multiple MX records with different priorities.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 6

Expert Comment

by:Nyah247
ID: 21795017
No...ISA doesn't have a queue.
0
 
LVL 28

Author Comment

by:peakpeak
ID: 21795034
How can it then "hold the mail" as you stated?
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21795037
That was a typo...sorry.  
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21795054
It cannot hold the mail...  You are "dead in the water" if Exchange is down.
0
 
LVL 28

Accepted Solution

by:
peakpeak earned 0 total points
ID: 21795060
I'm pretty good at mail server communication, just unsure how the ISA will react in a scenario I've described above
0
 
LVL 51

Expert Comment

by:Keith Alabaster
ID: 21897857
Hey Peter, have got your mail but have only just returned (today) from holiday after a few weeks in sunny Mexico. Didn't ignore you :).

Regards

Keith
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Exchange 2010 attachment from Visma 1 151
TMG Migration to F5 1 2,532
FOPE 1 day Quarantine Notifications 4 261
ForFront TMG Server Error 8 100
Microsoft's ISA Server has been its pre-eminent security product for about a decade and is still regarded amongst the well-informed as one of the best software firewalls and application gateways ever released, by any manufacturer. ISA Server has bee…
Forefront Threat Management Gateway 2010 or FTMG comes with some very neat troubleshooting tools built-in when trying to identify what is actually happening behind the scenes within the product when traffic is passing through its interfaces. To the …
When you create an app prototype with Adobe XD, you can insert system screens -- sharing or Control Center, for example -- with just a few clicks. This video shows you how. You can take the full course on Experts Exchange at http://bit.ly/XDcourse.
Concerto provides fully managed cloud services and the expertise to provide an easy and reliable route to the cloud. Our best-in-class solutions help you address the toughest IT challenges, find new efficiencies and deliver the best application expe…

947 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now