DNS

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The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

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I setup a Exchange 2016 Server in-house and cannot figure out why the Outlook Test Email AutoConfiguration on all in-house network clients and from the Exchange Server Management Shell Test-Outlook WebServices keep failing.  All workstations are Outlook 2016 and at first I also had a problem seeing the public folders but they are now viewable.  Something is goofy and I've triple checked everything and I can't figure it out.  Outlook says downloading address book for days.

Outlook had no problems when adding a profile finding the account automatically.  I've flushed DNS on all computers, rebooted, and tried a new Outlook profile - no chanage.  

OWA and ECP (Exchange Admin Center) work internal and external.  Cell phones have no problems adding accounts.  External DNS is setup.

Any assistance would be greatly appreciated.  I've tried so many fixes from other web site posts, articles, and many from other posts on Experts-Exchange.

Please see attached images to see failure messages and external DNS setup.

Regards,
Torrey
HD_AutoDiscover_Fail1.png
HD_AutoDiscover_Fail2.png
HD_AutoDiscover_Fail3.png
HD_AutoDiscover_Fail4.png
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I have a server 2012 R2 and have RDS installed. Its a single server that has all the roles, DC, DHCP, DNS, File, RDS,  i installed a 90day cert from comodo . If i go to a windows 7 machine and go to https://rds.domain.com/RDWeb and login when i run an app i get this error
"Your computer can't connect to the remote computer because the Remote Desktop Gateway server is temporarily unavailable" Try Reconnecting later or contact experts-exchange for assistance. "

If i do this from the server itself the apps open fine.
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CURRENT CONFIGURATION:

                           ROUTING TABLE:
#    Dest IP      Mask  Gateway IP  Metric Device Use Edit Drop
---------------------------------------------------------------------
1  10.188.45.91    32 10.188.45.91     1   poe0  0    
2  192.168.254.0   24 192.168.254.254  1   enet0 137888
3  default          0 Node1            2   poe0  105886

                            WAN CONNECTION TABLE:
PVC VPI/VCI IP Address          Subnet      GateWay      DNS Server    Encapsulation Status
PVC0  0/35 10.216.230.183 255.255.255.255 10.188.45.91 112.198.126.116     PPPoE       Up

                        *NEW* CONFIGURATION:
                           ROUTING TABLE:
#    Dest IP      Mask  Gateway IP  Metric Device Use Edit Drop
---------------------------------------------------------------------
1  10.216.xxx.xxx  ?? 10.188.45.91     1   poe0  0    
2  192.168.254.0   24 192.168.254.254  1   enet0 137888
3  default          0 Node1            2   poe0  105886

Can anybody - please - help me with a correct Mask (??)? :)

Regards,
WWW.GULDVOG.COM.PH Jan Guldvog
CEO/OWNER
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Hi all,

This is our setup:
- Sonic Firewall TZ300
- Barracuda Email security
- Server 2012 r2 with Exhange 2016
Latest updates are installed.

OWA works fine, outlook anywhere works fine.
Application Symprex for email signatures has an error trying to connect locally
MigrationWiz for migrating mailboxes doesn't work either.

Checking testconnectivity.microsoft.com results in error. Contacted above application providers: could be the problem with autodiscover.

Error is:
Attempting to test potential Autodiscover URL https://autodiscover.domain.nl:443/Autodiscover/Autodiscover.xml
       Testing of this potential Autodiscover URL failed.
       
      Additional Details
       
Elapsed Time: 1860 ms.
       
      Test Steps
       
      Attempting to resolve the host name autodiscover.domain.nl in DNS.
       The host name resolved successfully.
       
      Additional Details
       
IP addresses returned: 123.123.123.123 (correct of course)
Elapsed Time: 730 ms.
      Testing TCP port 443 on host autodiscover.domain.nl to ensure it's listening and open.
       The port was opened successfully.
       
      Additional Details
       
Elapsed Time: 510 ms.
      Testing the SSL certificate to make sure it's valid.
       The SSL certificate failed one or more certificate validation checks.
       
      Additional Details
       
Elapsed Time: 619 ms.
       
      Test Steps
       
      The Microsoft Connectivity Analyzer is attempting to obtain the SSL certificate from remote server autodiscover.domain.nl on port 443.
       The Microsoft Connectivity …
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Hi Experts.

I'm trying to figure out why/where  DNS traffic coming from a DNS/DC server to a now decommissioned server. I've checked the Forwarders on the properties of the DNS server and there are none, though according to network team there is a high amount of DNS traffic.

Are there any tools I could use local on the DNS server to determine this?
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I can ping by IPaddress but not by Hostname

I have a computer that I can ping by IP address, but I cannot ping it by host name.

The computer IP address is obtained via DHCP.
 if I ping IP address using -a , I can obtain Hostanme

When using NSlookup computername , I get the:
Name: computername.domainname.

when using Nslookup Ipaddress, I get the:

Name: computername.domainname.
Address: IP address

Any idea why I cannot ping by Hostname ?

Thank you
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I am looking for some clarification on the proper configuration of my DNS amd my email server.

Here is the setup:
I am using Comcast as my ISP and have an Exchange server running in my SBS2008. I have a static IP address assigned by Comcast and have registered a domain name pointing to it ( [b]abc.net[/b)]. I also have a company domain name that is abc.com. This domain points to an outside web and email server. I am using the Windows POP3 Connector to retrieve emails from the abc.com server and putting them into the Exchange mailboxes. (I know, nobody likes the POP3 Connector...) Then I am using the in house Exchange server to send emails directly from the domain <b>name@abc.com</a>

The problem:
Lately, I have been getting the error from Gmail accounts that I try to send to saying that the Reverse DNS for IPv6 is not properly configured, and that I must fix this before Gmail will accept emails from abc.com.

The question:
This is where it becomes a bit confusing for me. What is the proper way to set up the DNS configuration, and where. Currently, I have asked Comcast to set up the Reverse DNS for abc.net back to my IPv4 and IPv6 addresses, but Gmail is still blocking me. Should I also, or in place of, asked them to set the Reverse DNS for abc.com to my server, instead? Or is this something I should be doing on my SBS2008 DNS?
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Hello Lync / SfB experts.

I have a problem trying to fix a Skype for Business deployment.
Everything work fine internally. But internal users can't receive any message from external users.
External users will not see the internal users status (online/busy/offline).
For example if an internal user try to add a normal external Skype user, the external user accept the request, but the request will never be forwarded to the internal user. The external user will never be able to see the internal user status.

So I have checked basically all I could.

The external DNS record :

[Pointing to the EDGE server]
SIP.company.com / Public IP : OK / Port : 443-444-5061 / Protocol : TCP-TLS / Internal IP : OK (EDGE Server)
_SIP._TLS.company.com / CNAME to SIP.mycompany.com

[Pointing to the REVERSE PROXY server]
WEBEXT.company.com / Public IP : OK / Port : 80-443 / Protocol : HTTP(S) / Internal IP : OK  (Reverse Proxy Server)
LYNCDISCOVER.company.com / Public IP : OK / Port : 80-443 / Protocol : HTTP(S) / Internal IP : OK  (Reverse Proxy Server)
MEET.company.com / Public IP : OK / Port : 80-443 / Protocol : HTTP(S) / Internal IP : OK  (Reverse Proxy Server)
DIALIN.company.com / Public IP : OK / Port : 80-443 / Protocol : HTTP(S) / Internal IP : OK  (Reverse Proxy Server)

The Autodiscover test from the Microsoft Connectivity Analyzer is good :

autodiscover.png
The manual SIP connectivity test (by entering manually the SIP address and port) is also good.…
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Hi,
I just installed a new server with Server 2012 r2 Essentials, at first all seemed to be going well and I was able to additionally install Exchange 2013 SP1 on an additional server, joined that to the domain on the r2 Essential box and was able to link the two together in the Dashboard.

I additionally added the DHCP role to the 2012 r2 as I wanted to use a fixed IP address on the server to allow users to connect remotely and I got that set up and a scope defined and DHCP was up and running.

Not long after that the server started to have issues users would report that they could not connect to websites and occasionally to server shares.  After a lot of faffing about I decided the issue must be the Server's NIC was faulty. So I switched to the 2nd network socket (Dell PowerEdge 330 server) and after that things seemed to be running a lot better but after a while the issues came back and I now think the issue is that when DNS was configured when the original NIC was faulty even though we are now using the non-faulty NIC the DNS settings are still not configured correctly.

Can someone advise what the best way is to get the DNS settings back to a workable state.  I did a dcdiag on the 2012 Essentials box and get this:


C:\Windows\system32>dcdiag

Directory Server Diagnosis

Performing initial setup:
   Trying to find home server...
   Home Server = ServerName
   * Identified AD Forest.
   Done gathering initial info.

Doing initial required tests

   …
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Hi All,

Can anyone here please assist me in troubleshooting as to why my Outlook Web Access is randomly signing me off while reading or typing email ?

I also cannot access the below OWA option with HTTP ERROR 500:
Change OWA Account settings: https://owa.domain.com/ecp/?rfr=owa&owaparam=modurl%3D0&p=account
Change AD Password: https://owa.domain.com/ecp/?rfr=owa&owaparam=modurl%3D0&p=PersonalSettings/Password.aspx
Enable OWA Add On: https://owa.domain.com/ecp/?rfr=owa&owaparam=modurl%3D0&p=installed

However, when I manually type in the Public IP address or the server name instead of owa.domain.com, I can access the server with no problem.

This is my current deployment of the Exchange Server 2013 Standard Edition in my domain:

AD Site: Default-First-Site-Name
PRODMAIL14.domain.com [old CAS & MBX server]
PRODMAIL20-VM.domain.com [new CAS & MBX server]

AD Site: Head_Office
PRODMAIL42-VM.domain.com [CAS & MBX server]
PRODMAIL30-VM.domain.com [MBX server]

I have just created multiple A Record for OWA.domain.com and Autodiscover.domain.com pointing to my existing 3x CAS-MBX Exchange 2013 server roles.

Public DNS (A) records Round Robin:
OWA.domain.com – Public IP address of PRODMAIL14, PRODMAIL20-VM and PRODMAIL42-VM
Autodiscover.domain.com – Public IP address of PRODMAIL14, PRODMAIL20-VM and PRODMAIL42-VM

Internal DNS (A) records Round Robin:
OWA.domain.com – Public IP address of PRODMAIL14, PRODMAIL20-VM and PRODMAIL42-VM
Autodiscover
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We have two dns servers on our domain, they worked fine until recently. Not sure what has happened, but some clients  either can't go to sites at all or it is very slow getting there. Often a symptom is "resolving host" message when they go to internet.  We've found that manually making them go through google dns server 8.8.4.4 solves the problem. Questions: (1) what kind of problems are we likely to run into by making everyone go through google dns? (2) what could be causing our dns servers to be so inconsistent?
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Where within the Gmail admin console can the external DNS mail exchange (MX) records be changed for an organization using Gmail for its email?
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What is the process to determine which company hosts an organization's external DNS MX records?
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Hi,

I have recently installed a HP Server 2012 server and all has been running okay till one day it would not access the internet. The internal network is working okay and all the other workstations are connecting to the internet fine. I can rdp to the Server with no issues, updates are all installed, all setting are still as they were.

What I have noticed is that there seem to be two network connections (see attached file) there is only one network card in this Server.
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is it possible to get 100% fail over 100 % availablity using f5 to two IIS servers configured for load balancing in round robbin.

Each request to check if a server is active and route the call to the other server if one is down, without any downtime.

Also is it possible to queue a call if both servers are down and wait a certain period of time and make the call to the first available server?
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Hi,

We have an internal windows active directory domain called Catfood.com. We also have an external website called the same Catfood.com but it is hosted on an external cloud provider.

We have created a website on the cloud called gifts.catfood.com. This uses dynamic DNS.

I want to forward all DNS queries for gifts.catfood.com to an external DNS server.

How do I do this?

We are using windows server 2008 (but the domain functional level is windows 2003)

Thanks,
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I have a TZ105 and i setup SSL VPN with NETBIOS enabled. I configured the Client Settings DNS Server address for our internal dns server. So i can now ping hostname.domain.local but cant ping hostname. Any Suggestions?
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Hello,

When do you do network design, do you have dns record for firewall and  loadbalancer ? It is easier to see where packet is dropping.
Or any security concern on putting in DNS record?
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Hi, currently we have 2 AD forests with 2 way trusts. I am trying to retrieve all the name servers of Forest B from a DC in Forest A. I try to do this by running following command from DC in Forest A - nslookup -type=NS forestb.com

The command returns all 50 DNS servers in Forest A but only returns the IPs for half the servers. I expected the following results:

domain.com      nameserver = hostname1.domain.com
domain.com      nameserver = hostname2.domain.com
domain.com      nameserver = hostname3.domain.com
domain.com      nameserver = hostname4.domain.com
domain.com      nameserver = hostname5.domain.com
domain.com      nameserver = hostname6.domain.com

hostname1.domain.com           internet address = x.x.x.x
hostname2.domain.com           internet address = x.x.x.x
hostname3.domain.com           internet address = x.x.x.x
hostname4.domain.com           internet address = x.x.x.x
hostname5.domain.com           internet address = x.x.x.x
hostname6.domain.com           internet address = x.x.x.x

But instead the results are:

domain.com      nameserver = hostname1.domain.com
domain.com      nameserver = hostname2.domain.com
domain.com      nameserver = hostname3.domain.com
domain.com      nameserver = hostname4.domain.com
domain.com      nameserver = hostname5.domain.com
domain.com      nameserver = hostname6.domain.com

hostname1.domain.com           internet address = x.x.x.x
hostname2.domain.com           internet address = x.x.x.x
0
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Forgive the length, but I want to provide a detailed description of the problems I'm running into what I've checked so far:

I purchased Solarwinds DameWare to help with supporting PCs in-house. I started running into problems where it would not connect to some computers. Other computers worked fine. One of the error messages on DW said something along the lines of "The computer you're trying to connect to is actually a different computer. Do you want to continue?" So I started troubleshooting and running into some strange DNS weirdness.

Starting with the two computers involved with the error above, I pinged both by name from my PC and they both returned the same IP address. When I went to those PCs, one of them had that IP and the other had a different IP. Digging further, I started running into a few more computers that when pinged by name returned incorrect/duplicate IPs.

Some research indicated I might not have DNS scavenging turned on. Odd thing is, everything worked fine before installing DameWare. I was using UltraVNC for report desktop support, and now that won't connect to these problem PCs either. So I started checking my DNS settings on the Domain Controller. (I only have one DC and it is the only thing managing DNS that I am aware of.)

Logging into the Domain Controller > Server Manager > Tools > DNS
When I look in the tree under my server > Forward Lookup Zones > my domain, I'm seeing a list that includes records that are months or years out of…
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Hi all,

We have run into an issue where our DC in the Seattle office has started having some serious connection issues with our main office.
We have a static tunnel that connects the two sites and general connectivity seems unaffected, but within the past couple of weeks we are finding a number of issues, including replication errors, dns resolution problems from the Seattle site.
A quick check of the firewalls shows no ports blocked and full access should be possible. However, looking at a dcdiag of the Seattle dc (leseadc01) shows a multitude of problems. Would be very interested in hearing how others would organize and tackle this issue. Does it make sense to create a secondary DC in the office as well? I have attached the dcdiag output and look forward to any advice anyone may have.
Thanks
TS
leseadc01-dcdiag
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I have 2 ADFS servers and 2 WAP, we don't have any internal DNS zone for company.com where I could create an A record for adfs.company.com, so adfs.company.com is resolved through internet internally i.e the traffic to adfs.company.com either internally or externally resolves through public DNS. I want to achieve integrated windows authentication for the users who are on intranet and form based authentication for the users on extranet , the later is ok but getting IWA for internal users is an issue, can the experts out there throw some light on this.Thankyou
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Hi - we have a school that we are setting up the students with Gmail accounts using the school's domain name. The teachers currently have their email accounts setup thru Rackspace, and we'd like to continue to keep the teacher accounts this way using Rackspace. From an MX record / DNS standpoint, how do we go about doing this? Can we have incoming email for the same domain going in 2 different directions, for students (Google) and teachers (Rackspace)?
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Hello,

I have two DC, I'm trying to decommission the secondary DC; so first I have depromoted the server successfully and now i'm trying to uninstall AD and DNS but I'm getting the following error: removal of one or more roles role services or features failed. error 0x8000ffff
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Hi

Unfortunately our primars dns had a HD failure.

So I have set up a new server and need to recover from the secondary bind9 dns server.

How do I do that, to transfer all settings and zones from the secondary dns server to the new primary server?

Thanks!
0

DNS

25K

Solutions

25K

Contributors

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.