Comments on: Misconfigured Subnets Appear in Exchange Server 2013 DAG Network https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/ Practical Office 365 News, Tips, and Tutorials Wed, 27 Mar 2019 00:01:21 +0000 hourly 1 https://wordpress.org/?v=6.6.1 By: Christopher Kelly https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-196683 Wed, 27 Mar 2019 00:01:21 +0000 https://www.practical365.com/?p=6071#comment-196683 Hi all,
I just ran into this problem and the issue was that the Replication network did indeed have the register in DNS enabled. After solving that problem , I found you could also re-run the Set-DatabaseAvailabilityGroup E15DAG -DiscoverNetworks and that also resulted in Exchange correcting the setup.

]]> By: Gautam Gupta https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-158018 Wed, 04 Apr 2018 10:14:50 +0000 https://www.practical365.com/?p=6071#comment-158018 Hi Mark,
I have exchange 2013 server with 12 Nodes , 8 in DC and 4 in DR
When I run the command get-databaseavailibilitygroupnetwork I dont get any response and I have to press ctrl+c to get the cursor back. Even in EAC the cursor keeps on saying please wait on the databaseavailibitlygroup page and I cant see the network config of DAG. I have some subnet/routing issues on 2 of my DR Nodes which I want to correct but I am not sure what to do when I am unable to run the get-databaseavailibilitygroupnetwork command
pls help

]]> By: <div class="apbct-real-user-wrapper"> <div class="apbct-real-user-author-name">Paul Cunningham</div> <div class="apbct-real-user-badge" onmouseover=" let popup = document.getElementById('apbct_trp_comment_id_17749'); popup.style.display = 'inline-flex'; "> <div class="apbct-real-user-popup" id="apbct_trp_comment_id_17749"> <div class="apbct-real-user-title"> <p class="apbct-real-user-popup-header">The Real Person!</p> <p class="apbct-real-user-popup-text">Author <b>Paul Cunningham</b> acts as a real person and passed all tests against spambots. Anti-Spam by CleanTalk.</p> </div> </div> </div> </div> https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17749 Sun, 16 Oct 2016 12:38:13 +0000 https://www.practical365.com/?p=6071#comment-17749 In reply to jailaubek.r.

Having a separate “public” network for client connectivity is not going to work. Clients connect to the MAPI network, and only one network can be client-facing.

]]> By: jailaubek.r https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17748 Fri, 14 Oct 2016 04:41:16 +0000 https://www.practical365.com/?p=6071#comment-17748 Hi Paul,
We have exch-mbx1,exch-mbx2 (exchange server 2016) servers. exch-mbx1 has MAPI,replication interfaces and exch-mbx2 has MAPI,replication,Public interfaces. We use that Public interface to connect OWA and OutlookAnywhere from internet.
When we run test-replicationhealth, clusternetwork is failed and error message is Subnet on network “MapiDagNetwork” is not up. Current state is misconfigured.

Please, help me to solve that problem 🙂

]]> By: MAu Flores https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17747 Tue, 09 Aug 2016 17:31:28 +0000 https://www.practical365.com/?p=6071#comment-17747 Hi Paul, in the past I have successfully set up several DAG (2010 and 2013) with networks in AUTO mode and MANUAL, but right now I have a very strange problem…

If I set the settings in AUTO mode, create the DAG sucessfull without errors, but the MAPI network and ISCI leave them enabled replication; that’s not good, you know. I caný disable replication because it is AUTO mode.

Then if I switch to MANUAL mode, I can configure manually my 3 interfaces correctly and all good. But when you restart the Exchange 2013 Mailbox servers Exchange change my settings again and leaves interfaces and ICSI MAPI-enabled replication.

I confirm you that I have reviewed 5 times each interface and each one is configured correctly according to the requirements of Microsfot and of ExchangeServerPro web site. I dont´have configuration interfaces failure. By the way, my networks ISCI and REPLICATION are private networks and isolated VLAN.

You think it’s a new BUG/ISSUE of Exchange 2013 ??? My servers has SP3 with CU13.

I hope you help me please , regards!

]]> By: Alison https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17746 Thu, 30 Jun 2016 11:46:02 +0000 https://www.practical365.com/?p=6071#comment-17746 Hi Paul, I have a situation where I have 2x EX2013 servers in a London datacentre in a DAG, plus I have 2 further EX2013 servers in another Datacentre in Germany across the WAN.
If I add a copy of one of the London databases to any of the German Exchange servers, the network utilisation goes through the roof ( maxed out).
I guess a replication network would not ease this issue,or would it?
Would using Policy-based QOS via group policy to throttle the outbound throttle rate help in this instance, or would I see backpressure events due to delaying the replication?

]]> By: <div class="apbct-real-user-wrapper"> <div class="apbct-real-user-author-name">Paul Cunningham</div> <div class="apbct-real-user-badge" onmouseover=" let popup = document.getElementById('apbct_trp_comment_id_17744'); popup.style.display = 'inline-flex'; "> <div class="apbct-real-user-popup" id="apbct_trp_comment_id_17744"> <div class="apbct-real-user-title"> <p class="apbct-real-user-popup-header">The Real Person!</p> <p class="apbct-real-user-popup-text">Author <b>Paul Cunningham</b> acts as a real person and passed all tests against spambots. Anti-Spam by CleanTalk.</p> </div> </div> </div> </div> https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17744 Thu, 05 May 2016 06:05:04 +0000 https://www.practical365.com/?p=6071#comment-17744 In reply to azmi.

You can block database copies, or an entire server, from automatic activation. Look into activation policies for mailbox servers.

]]> By: azmi https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17743 Wed, 04 May 2016 09:44:21 +0000 https://www.practical365.com/?p=6071#comment-17743 Hi Mr Paul ,
i have two datacenter, where 1 – HQ, 1 – DR.
in HQ site, we have 2 mailbox, and in DR site, only 1.
We already create 1 DAG for this 3 server.
We already set the preference where, 1 and 2 parameters was set to HQ server and
3 set to DR server. Issues is, we will have intermittent network between two datacenter.
That network is not under our control and when have something issues with that network,
our database will split, some will go to DR server .But we dont want that happen. As we decide for DR server will be passive and only will be up if both server at HQ totally down. (etc Because disaster) .

We configured for failover cluster automatically move. But have any idea, where we can prevent it happen ? our quorom /share witness server in HQ.
i hope have any solution so we can prevent it move to DR automatically. We also have set timeout 60 min.. But still happen.

]]> By: Scott https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17742 Fri, 15 Jan 2016 02:38:34 +0000 https://www.practical365.com/?p=6071#comment-17742 Paul, i need to change just the subnet mask of the DAG Replication Network. i cannot do this in EMC i need to go from /24 to a /26 Subnet mask. I cannot add it and i cannot change the /24 to /26 because it gives me “Subnets parameter must be distinct and not overlap”. I’ve already changed the Subnet mask of the Network Adapters which reflect properly to match the nic settings 255.255.255.192. Thanks for your advice!

]]> By: Abu https://practical365.com/misconfigured-subnets-exchange-2013-dag-network/#comment-17741 Fri, 20 Nov 2015 13:55:21 +0000 https://www.practical365.com/?p=6071#comment-17741 Dear Paul,

Your valuable innformations have helped me lot so may times.
I have a 3 member DAG with exchange 2013,two servers in PR and one in DR,i have found that the PR to DR replication is fine,while DR to PR replication is not working,after reading this article of yours,i have found in my DR server there is only one netwrok adapter,
My question is if diiferent sites require mutliple adapter then how come my PR to DR replication is working fine?
Please correct me ,my DR to PR replication is still failing i need to correct it ASAP

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