Comments on: iPhone and Exchange – push and DNS http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/ Musings on just about everything. Fri, 27 Jan 2012 16:23:04 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Andy http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132973 Andy Tue, 24 Jan 2012 17:44:20 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132973 @MACIT worked great for me after I created a .pac file and set my proxy to auto (with a exception for local addresses) as I use a proxy server. I originally added a host(A) record for address to the correct dns zone which was hosted on another DNS server. My DNS is confgured to forward any unknown requests to this server. It resolved correctly via NSLOOKUP but the Mail client (Exchange) would not confgure until I created the absolute DNS zone with pointer record on my local DNS server, MACIT, is there any specific reason why is failed when the I was using a DNS forwarder for the zone? Andy @MACIT worked great for me after I created a .pac file and set my proxy to auto (with a exception for local addresses) as I use a proxy server.

I originally added a host(A) record for address to the correct dns zone which was hosted on another DNS server. My DNS is confgured to forward any unknown requests to this server. It resolved correctly via NSLOOKUP but the Mail client (Exchange) would not confgure until I created the absolute DNS zone with pointer record on my local DNS server,

MACIT, is there any specific reason why is failed when the I was using a DNS forwarder for the zone?

Andy

]]> By: Michael http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132880 Michael Fri, 29 Jul 2011 12:20:15 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132880 Having pottered around a bit, I discovered that it is always the obvious things that we overlook - anyway, we use DynDNS, and as a result of the crash last night, one of our servers, you guessed it, the Exchange server, did not update its IP address. I found that out when I tried to run OWA externally. So, always check IP addresses - that's where the screw-ups happen - a lot :) Cheers :) Having pottered around a bit, I discovered that it is always the obvious things that we overlook – anyway, we use DynDNS, and as a result of the crash last night, one of our servers, you guessed it, the Exchange server, did not update its IP address. I found that out when I tried to run OWA externally. So, always check IP addresses – that’s where the screw-ups happen – a lot :)

Cheers :)

]]> By: Michael http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132879 Michael Fri, 29 Jul 2011 09:57:33 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132879 Hi: I have read through some of this thread as my system has suddenly stopped doing the push thing to my iphones (3G running IOS 4.2.1) from yesterday after the server crashed. I have run through my server config and nothing has changed (Exchange 2003 running on 2003SBS SP1). So I still have some work to do! However, I have set up split DNS on our server, so that whether I connect internally via wifi or externally via 3G, I always connect to the same host - and that has worked perfectly up until yesterday. So it might be something to consider - and it is not hard to do. I found a useful reference site at URL: http://www.amset.info/netadmin/split-dns.asp Cheers. Hi:

I have read through some of this thread as my system has suddenly stopped doing the push thing to my iphones (3G running IOS 4.2.1) from yesterday after the server crashed. I have run through my server config and nothing has changed (Exchange 2003 running on 2003SBS SP1). So I still have some work to do!

However, I have set up split DNS on our server, so that whether I connect internally via wifi or externally via 3G, I always connect to the same host – and that has worked perfectly up until yesterday. So it might be something to consider – and it is not hard to do. I found a useful reference site at URL: http://www.amset.info/netadmin/split-dns.asp

Cheers.

]]> By: Ben http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132809 Ben Thu, 26 May 2011 00:40:23 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132809 @MACIT, Worked well for me mate, was just missing the ptr, thanks for the help. @MACIT, Worked well for me mate, was just missing the ptr, thanks for the help.

]]> By: Essa Moshiri http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132343 Essa Moshiri Fri, 05 Nov 2010 21:29:41 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132343 Hi, I found this website as i have had same issue as everyone else. Software / Hardware: HP Proliant 110ML ESX server 4.1 Build 260247 8 Gig RAM 500 Mb Disk Mailserver Windows 2008 R2 4 Gig ram Exchange 2010 -------- Problem description: When on LAN i can't sync my Iphone 4.1 with the exchange server. Push does not work and error "Cannot Get Mail - The connection to the server failed". My setup is an Router which sits on 192.168.0.50 and the WAN DNS is set to Opendns IP address. Solution: I relized that the issue is down to DNS, suggestion to use the external DNS seems that it has not worked for me at all. I found that if i use the internal DNS which is 192.168.0.9 than the sync works just fine. I hope this helps somone who has the same issue. Thank you Essa Moshiri Hi, I found this website as i have had same issue as everyone else.

Software / Hardware:

HP Proliant 110ML
ESX server 4.1 Build 260247
8 Gig RAM
500 Mb Disk

Mailserver
Windows 2008 R2 4 Gig ram
Exchange 2010
——–
Problem description:
When on LAN i can’t sync my Iphone 4.1 with the exchange server. Push does not work and error “Cannot Get Mail – The connection to the server failed”.

My setup is an Router which sits on 192.168.0.50 and the WAN DNS is set to Opendns IP address.

Solution:
I relized that the issue is down to DNS, suggestion to use the external DNS seems that it has not worked for me at all. I found that if i use the internal DNS which is 192.168.0.9 than the sync works just fine.

I hope this helps somone who has the same issue.

Thank you
Essa Moshiri

]]> By: gregr http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132148 gregr Mon, 29 Mar 2010 20:04:28 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132148 @MK - your proposed configuration is exactly what _causes_ the problem I described. If you read the KB article I linked to, it calls out this configuration specifically as an issue. @MK – your proposed configuration is exactly what _causes_ the problem I described. If you read the KB article I linked to, it calls out this configuration specifically as an issue.

]]> By: MK http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132147 MK Mon, 29 Mar 2010 10:49:13 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132147 I got around this issue in a different way and this information may be of help to some of you. As some routers/firewalls don't allow you to NAT loopback what you can do is create a new zone in your internal DNS with an 'A' record for mail.mycompany.com with the INTERNAL IP of your exchange server. (Assuming your normal internal domain is mycompany.local or similar so is different to your external domain name) So basically when on corporate Wifi mail.mycompany.com resolves to the internal IP and when external to the system it resolves to the external IP. You will have to create the other records for www and the like as your internal DNS server will think it's responsible for the domain (even though it may really not be). mail.mycompanyname.com will be the server used in the Activesync configuration. MK I got around this issue in a different way and this information may be of help to some of you.

As some routers/firewalls don’t allow you to NAT loopback what you can do is create a new zone in your internal DNS with an ‘A’ record for mail.mycompany.com with the INTERNAL IP of your exchange server. (Assuming your normal internal domain is mycompany.local or similar so is different to your external domain name)

So basically when on corporate Wifi mail.mycompany.com resolves to the internal IP and when external to the system it resolves to the external IP. You will have to create the other records for www and the like as your internal DNS server will think it’s responsible for the domain (even though it may really not be).

mail.mycompanyname.com will be the server used in the Activesync configuration.

MK

]]> By: Geoff http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132143 Geoff Tue, 16 Mar 2010 05:30:28 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132143 I am having a problem getting new contacts to push to my iPhone. When I setup my email it loads contacts, mail items, and calendar items perfectly. The Exchange Server also pushes calendar events and email over perfectly..... HOWEVER, it will not push NEW contacts over to my iPhone. ie: If I add a contact in Outlook, it does not push the contact to my iPhone. It DOES add the contact to my Exchange Server though. What is even more interesting, is that if I add a contact in my iPhone, it WILL add that same contact into my Outlook. If I add my contacts through the Webmail Exchange Server, it will add the contact to both Outlook and my iphone. How can I configure this properly so that when I add new contacts in Outlook it pushes it to my iPhone? One last thing, is that I am also not able to access my Global Address Book from my iPhone that sits within my Outlook. The option on my iPhone appears under the "Groups" in my "Contacts" but when I click on it there aren't any names that appear. Any suggestions? I am having a problem getting new contacts to push to my iPhone. When I setup my email it loads contacts, mail items, and calendar items perfectly. The Exchange Server also pushes calendar events and email over perfectly….. HOWEVER, it will not push NEW contacts over to my iPhone. ie: If I add a contact in Outlook, it does not push the contact to my iPhone. It DOES add the contact to my Exchange Server though. What is even more interesting, is that if I add a contact in my iPhone, it WILL add that same contact into my Outlook. If I add my contacts through the Webmail Exchange Server, it will add the contact to both Outlook and my iphone.

How can I configure this properly so that when I add new contacts in Outlook it pushes it to my iPhone?

One last thing, is that I am also not able to access my Global Address Book from my iPhone that sits within my Outlook. The option on my iPhone appears under the “Groups” in my “Contacts” but when I click on it there aren’t any names that appear. Any suggestions?

]]> By: Gabe http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-132084 Gabe Thu, 21 Jan 2010 04:36:51 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-132084 These dns solutions will only work if your router/firewall is configured to support NAT loopback. Some lower/mid-range consumer devices don't support it at all. These dns solutions will only work if your router/firewall is configured to support NAT loopback. Some lower/mid-range consumer devices don’t support it at all.

]]> By: Chris Abichandani http://www.rassoc.com/gregr/weblog/2008/07/18/iphone-and-exchange-push-and-dns/#comment-131950 Chris Abichandani Fri, 18 Dec 2009 16:40:11 +0000 http://www.rassoc.com/gregr/weblog/?p=518#comment-131950 @gregr, you are correct. I have a wildcard cert that I got from RapidSSL. They are only $199. So *.mydomain.com has been secured for quite some time. Wildcart certs NOW cost what REGULAR certs USED to cost! Totally worth it in my book. http://www.rapidssl.com/index_ssl.htm @gregr, you are correct. I have a wildcard cert that I got from RapidSSL. They are only $199. So *.mydomain.com has been secured for quite some time. Wildcart certs NOW cost what REGULAR certs USED to cost! Totally worth it in my book.

http://www.rapidssl.com/index_ssl.htm

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