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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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Hi, I have created an account for the user, however whenever we try to login to network machine it comes back with the error message no logon servers available.

I have created another account, which logs in totally fine?

Computer is on domain, and network cable is good too, because one account logs in properly and that account was never used to logon to that machine
 
Any ideas?
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I have exchange server 2010 and we have set mail relay to logix. Means, our exchange send email to Logix and then logix forward email to repient domain. But today our exchange is not connecting with logix. earlier IP reputation was poor, so I changed the IP of exchange and same NAT in firewall. OWA is working fine using IP and DNS name. Again, I set relay to LOGIX, it  is not connecting with exchange.

451 4.4.0 Primary target IP responded with: "421 4.4.2 connection drop due to socket error. "attemped failover to alternate host but that did not succeed. Either there are no alternate host or delivery failed to alternate host."
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so we have a SBS 2008 server (physical)

We are soon moving servers to a nearby colo.... hopefully it will be offline <48 hours but worst case if something goes wrong, I think ALL the domain PC's will be useless... The colo offers colo/cloud mesh, so I was thinking maybe I could restore the server from a backup into a VM they provide, and run it from there until the physical server gets there (hopefully only 24/48 hours), then shutdown the VM and power the original machine back on.

I'm curious if there are any problems with this...

A. if we don't make changes to users/config - should it be OK that the real SBS server won't know what happened during the time it was running in a VM?

B. Im sure the windows licenses are tied to the hardware... Is it OK/feasible though to run it in a VM for just a couple days for stopgap measures?   I would hope microsoft allows this sort of thing for these extenuating circumstances

C. If I can't do this - is there a way to "get by" for a few days on the other PC's?  e.g. I think if there is a problem with domain server you can unplug PC's from network, login, and then plug back into network... is that right?  And if so, could I also log in as domain administrator?  Or only if I had logged in as domain admin before the SBS was down?  And if I can, then could I temporarily change the DNS on the PC to a public DNS so it could atleast function at a basic level until SBS is back online?

Thanks!
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Dear Experts,

We are having a connection issue using Fortigate FSSO.

Users are not able to connect to their server using the FSSO as the source address in the firewall policy.

My client had to set it to "All" so that all the FSSO users can access the server without andy intermittent connection issues.

We suspect the the Fortigate collector agent cannot connect to the AD using the ldap.

This is because when I try to access the AD from the Collector Agent, I am not able to procees further after DC=local then DC=domain. None of the OUs appeared. We have rekeyed in the Pwd but it did not help.

We tried the binding using the ldp.exe and got this message

53 = ldap_set_option(ld, LDAP_OPT_ENCRYPT, 1)
res = ldap_bind_s(ld, NULL, &NtAuthIdentity, NEGOTIATE (1158)); // v.3
      {NtAuthIdentity: User='User'; Pwd=<unavailable>; domain = 'domain'}
Error <81>: ldap_bind_s() failed: Server Down.
Server error: <empty>

What other test can I do on the two DC servers to test this particular domain accounts connection?
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We Can't sending Email to our customer , Message Blocked and below are replay from mailer -deamon @ google .com

The response from the remote server was:
550 5.7.1 <ary@primatata.com>: Sender address rejected: Service unavailable; SPF check failed and transaction closed due to the organization's policy

What should we do?? Thanks
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Promoting a server to a domain controller against a domain with a NATed IP is not working.  
 
Authentication to the NATed IP works, but the promoting of the domain controller fails.
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I am installing Windows 2016 server standard this afternoon.  By end of Day, I want to set up a local Domain with following roles: AD, DNS, DHCP.  I want to have 2 users.  Simple network for now.

Could someone give me a setup list I could follow?  Any suggestions?

Comcast will be in bridge mode--->SW.
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Hi,
I have enabled a domain Group Policy Object on the that disabled Internet Connection Sharing and Network bridging on the DNS domain network. Funnily enough, when I disconnect from the domain network but leaving the workstation still joined to the domain, if I connect to a wifi network not related to the domain, I am able to create bridges after rebooting the PC, but the ICS tab still has the GPO being enforced. I am confused if ICS is actually working fine or if bridging is actually working fine. What is to be understood that the GPOs are only enforced if they are on the DNS domain network, having the PC only joined to a domain not paying attention to which network the PC is connected to, or having the PC joined to a domain while also being on the network of that domain?
Your feedback is highly appreciated.

Thanks
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Dear Experts,

I used this site to prepare and do the exchange migration.
Migrating a small organization from Exchange 2010 to Exchange 2016 (Part 1) - TechGenix

after step 4 : Updating Exchange 2010 Virtual Directory URLs : Enable-OutlookAnywhere -Server $Server -ClientAuthenticationMethod Basic -SSLOffloading $False -ExternalHostName $HTTPS_FQDN -IISAuthenticationMethods NTLM, Basic

If first receive an error that the RPC connection allready exists.

and after updating the DNS records from mail.

I am unable to get the Outlook clients connected to the new mailserver 2016. it constantly asks for credentials and is unable to start outlook.

I think this can also be because the first IT provider has called the exchange 2010 server “mail”.
after changing the A records Mail. the new 2016 server loses connection with 2010.

any tips? can i rename the old server without any problems? so i can easily change the A record?
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Have a wierd DNS behavoiur and wanted to check my understanding of the flow of DNS in MS DNS servers

  1. A User types in address www.company.com.uk
  2. If the sites Server 2008 R2 server is the authoritative server it responds with the details
  3. If the sites Server isnt authoritative, it asks via the default gateway, the DNS server of the ISP
  4. If that isnt returned in time, it then queries the root hint server for that domain prefix alphanumeric c.root-ervers.net

In short it does check the root hints last
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Hi Experts,

I have stumbled upon something tricky here and hoping someone can help me get to the bottom of it....

I was asked to setup Office 365 for a new customer so they could move away from their isp email and use it like a business should with their own domain name.....

So I set forth on my first Office 365 mission purchased through a provider set it all up obtained access so I could point the required records.... so far so good... well at least I thought, that was until the client let me know some mail was not reaching them!

Two reasons we knew....some who were attempting to email them received NDR's, the other way we knew was that I had setup forwarding on the ISP email (whilst they went through the motions of a new email address after years of using the ISP one) to forward directly to the new email address in which not all of it made it to the new email address. Most mail gets through but not all of it.

Test after test and liaising with the provider of the office 365 license and then finally onto Microsoft who blamed the forwarding on the ISP end (Which is incorrect) as it didn't explain the NDR's...

Upon further investigation I have found that there is some hang up on what used to be their webhost and provider of name servers!!! please see attachment for results.

It should resolve to

icertified.net but it answers to bigcommerce who they have not used for 5 years how is this so I asked them for proof and what they sent me appears to back up…
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I am setting up a small business network.  DNS and AD is being managed on Win Server 2016.  Should I have Windows Server manage DHCP as well?  I was thinking about having a sonic wall fw manage DHCP, VPN.  

If I want remote users to connect to the vpn authenticating with domain credentials, does this sound right? Any suggestions on Network Topology?
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Good day to you all,
Our network have 2 DC's (AD01 & AD02) with around 4 member servers and 80+ client PC's (Windows 7 and 10 pro mixed).
Everything was/is working fine and sometimes (past few weeks) one of the government websites here (https) doesn't resolve for some client PC's.
We used to clear the cache and flushdns to resolve it but now its getting very frequent. So we tried to run the dcdiag command in both the domain controllers to which we found the following errors. Find the dcdiag /test:dns log's attached for both the DC's.

WMIDiag 2.2 has been run in both the DC's with no errors.

Awaiting a positive response.

Thanks,
Mohamed Marzook.
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I have local domain  abc.com  and external website www.abc.com 
i have added a host record to the DNS pointing to the external website IP address

but still internal users try to access abc.com via a web browser it will result in 'Page cannot be displayed'
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I would like to know  if it is  DHCP server that updates the DNS record for clients, or the clients themselves will update their DNS records in DNS Server.

For instance when DHCP server hands out an IP address to CLientX, would this client  update its DNS record on the DNS server or DHCP server would do it on behalf of the client ?

Thank you
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How can I set this up to be able to communicate from one container that I am running as a task and a service inside of AWS ECS ?

Do you need to do something with the load balancer or network or something?
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We are implementing Skype for Business O365.  I configured External DNS (Go Daddy) with an appropriate CNAME and SRV records  for Skype for Business O365.  Externally (outside of my office network), I am able to connect to Skype but I can not connect in the office. it says that Server is unavailable after typing a password.

In the office we have Windows Server 2012 DNS server  (split brain DNS) for our domain.

How should I configure my internal DNS to make it work. I tried to configure My internal DNS exactly as external but for some reason it does not work.

Please let me know if you have ideas why it does not work internally (in the office network).
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I have never set up a DNS server before.  Right now we have an SBS server that is our DNS server - but we are probably doing away with windows... Or atleast only using the domain for a small number of PC's.

Other than public internet DNS, there are just a handful of DNS entries that I need for a handful of internal servers.  

Before I look into this too much, I'm just curious how hard people think this is to do?  I'm confortable at linux command line, and I know how to set up my DHCP server to change the DNS server address, etc.... Really I am just curious how difficult it is to just setup DNS server on redhat/centos and other than passing public DNS records, having just a handful of internal A records.  

Thanks!
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I have installed skype for business server in internal network, but i am unable to login from the same domain. i have checked everything. DNS records are fine, users are enabled and when i captured the packets using wireshark, the strange thing is my client is sending FIN packet after successful TLS handshake with the server. If someone knows the solution kindly reply.
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Event Type:      Error
Event Source:      DNS
Event Category:      None
Event ID:      6525
Date:            11/16/2017
Time:            3:22:50 PM
User:            N/A
Computer:      SSC-ENG03.ark-les.prv
Description:
A zone transfer request for the secondary zone 168.192.in-addr.arpa was refused by the master DNS server at 192.168.123.9. Check the zone at the master server 192.168.123.9 to verify that zone transfer is enabled to this server.  To do so, use the DNS console, and select master server 192.168.123.9 as the applicable server, then in secondary zone 168.192.in-addr.arpa Properties, view the settings on the Zone Transfers tab.  Based on the settings you choose, make any configuration adjustments there (or possibly in the Name Servers tab) so that a zone transfer can be made to this server.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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Hi,

Will disabling network bridging through Windows GPOs also affect IP assignments on virtual machines hosted in Hyper-V, VMWARE or Virtual box? Need to check if someone already tested this out as currently I don't have the resources to test. I would like to know if disabling network bridging through GPO will also prohibit virtual machines to be assigned the IP of the host when choosing the bridging option from either Hyper V, VMWARE or virtual box.

Thanks in advance.
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Hello,

We have few Linux servers and that has connected to 2-3 vlans and  that has NFS file system mounted from different server. For an example NFS server is registered with 192.168.10.x, that is where all the our production payload traffic goes. We would like to move NFS traffic to different Vlan like 172.10.10.X. Since many of them are using NFS servers, we don't want to change the DNS name, but I was planning to add new IP and hostname in the /etc/hosts file, so it would take local /etc/hosts entry rather than going through DNS.

Basically I want all the NFS traffic to be go through  172.10.10.X
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Hi,

  I have an odd issue with the domain controller for one of my customers. We have recently updated some software on the server and updated the AV software. Ever since every night, the server seems to loose connection to its own domain). So when I go into network and sharing center, it does not say "domain.local" it just says "network" or "network 2".  This then stops users from accessing some software that runs from the server, but they seem to keep network drive access.

The only way I have figured out to do this is to, reboot the server then disable and enable to network adapter.

I noticed there was a error with Dcom not communicating with the IP of the server so i tried this fix https://community.spiceworks.com/topic/288546-dcom-was-unable-to-communicate-with-the-computer-64-99-64-32
That did not resolve anything.

I have checked all services i.e. DNS, AD etc... are running, and they are.

I also seen online, someone saying it was caused by there default gateway. Mine of course is a router, and I am able to ping it no problems. So i'm not sure this is the correct path.

The Domian controller is also a VM, its OS is 2008r2 and the VM host is server 2012 r2.

I'm at a dead end on this one. so any help would be appreciated.
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Hello guys,

I´m trying to fix issue when all Exchange services wont start after I reboot Exchange server.
Been trying to fix this almost entire weekend and I´m out of ideas :/

My environment is
2VMs running on vmware 6.5

1st vm: DC with GC, DNS, DHCP, NPS
2nd: only Exchange server

Both running on Windows Server 2016

Appreciate any help!!

Regards

Jiri
ev.JPG
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Hi guys
some servers in my domain have lost all their dns entries, probably due to some network cards errors in migrating VMs to a new infrastructure. Apart from name resolution, no issue is detected at AD level, i mean the servers authenticate correctly
Now the network configuration has been fixed, how do i fix the missing dns entries? just manually add A records for the servers, o i better remove the servers from the domain and join them again to have the dns entries automatically added ?

If the second was the case, whats the risk in removing and joning a servers with application installed?

thanks a lot for your help
MA
1

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.