Solved

Cannnot connection with RDC using hostname

Posted on 2015-02-16
13
79 Views
Last Modified: 2015-02-17
I have a domain with two dc's. I have been using RDC to access one from the other, that is until this morning. Now, I get the error msg that "the target computer is not accessible because it is either 1) turned off or 2) RDC is turned off or 3) the computer is not on the network." None of this is true. After research I found that I could connect using the target machine's IP. But when I ping it the DNS resolution is to the network's public IP and it fails. I checked th e DNS service on both DC's. On the target machine it's working, but on the other DC, it has failed to start with an error code 4000, "The DNS server was unable to open Active Directory.  This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it.  Check that the Active Directory is functioning properly and reload the zone. The event data is the error code."  What to do next? How does one re-load a zone and how could this have suddenly stopped working?
0
Comment
Question by:PCGenieLA
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 7
  • 6
13 Comments
 
LVL 6

Expert Comment

by:Steve Whitcher
ID: 40612418
When DNS failed to start, was that just after a server reboot?  Have you tried starting the DNS service manually?  Does it still fail?
0
 

Author Comment

by:PCGenieLA
ID: 40612521
It seems to have stopped working after the last weekly update.  In server manager DNS says it is running but  nothing changes when I restart it manually, except another 4000 error code.  BTW, the log lists a 4000 error every 11 minutes.
0
 
LVL 6

Expert Comment

by:Steve Whitcher
ID: 40612530
Often, a DNS Event ID 4000 will be accompanied by another event, such as ID 4013 or 4015.  Are these or other events appearing along with the 4000?

What version of windows are the DC's running?

Also, can you run an "ipconfig /all" on the affected server and post the output here?
0
Guide to Performance: Optimization & Monitoring

Nowadays, monitoring is a mixture of tools, systems, and codes—making it a very complex process. And with this complexity, comes variables for failure. Get DZone’s new Guide to Performance to learn how to proactively find these variables and solve them before a disruption occurs.

 

Author Comment

by:PCGenieLA
ID: 40612540
There i are multiple 4521:
The DNS server encountered error 13 attempting to load zone jskent.local from Active Directory. The DNS server will attempt to load this zone again on the next timeout cycle. This can be caused by high Active Directory load and may be a transient condition.

and one 708:
The DNS server did not detect any zones of either primary or secondary type during initialization. It will not be authoritative for any zones, and it will run as a caching-only server until a zone is loaded manually or by Active Directory replication. For more information, see the online Help.
0
 
LVL 6

Expert Comment

by:Steve Whitcher
ID: 40612556
Check the network settings on that server.  Does it have just one adapter?  What is it's IP address, and what are the DNS servers it's pointing to?  (Is it pointing to itself?)
0
 

Author Comment

by:PCGenieLA
ID: 40612772
The source server (not the target) shows IPs 192.168.1.11 and 12.
DNS servers are 192.168.1.11 and 12.  The target server is 192.168,1.8 & 43. It seems to have the only working DNS service yet the source server doesn't refer to any machine but itself.
0
 
LVL 6

Expert Comment

by:Steve Whitcher
ID: 40612877
Just to make sure I'm clear, let's call them ServerA and ServerB

ServerA has 2 network adapters, with IP's of 192.168.1.11 and 192.168.1.12
The DNS servers for each network interface are pointing to 192.168.1.11 and 192.168.1.12

ServerB also has 2 adapters, with 192.168.1.8 and 192.168.1.43


Is ServerA the one with the DNS errors in the event log?
What are the dns server settings on ServerB's network adapters?

If each server is only pointing to itself for DNS resolution, that's going to cause issues.  I would suggest you change the secondary DNS server on each one to point to the other server.
0
 

Author Comment

by:PCGenieLA
ID: 40613078
Server B  192.168.1.8 is pointed to 192.168.1.12 and to 127.0.0.1
Server B 192.168.1.43 is pointed to 192.168.1.11 and 192.168.1.12
Server A 192.168.1.11 is pointed to 192.168.1.11 and 192.168.1.12 and 127.0.0.1
Server A 192.168.1.12 is pointed to 129.168.1.11 and 192.168.1.12 and 127.0.0.1
0
 
LVL 6

Accepted Solution

by:
Steve Whitcher earned 500 total points
ID: 40614194
Server A is the one that has the DNS errors in event log?  
And you're on Server A, trying to connect to Server B.  And from server A, you try to ping Server B by name and resolution fails?

That makes sense - looking at Server A's DNS config, you have it set to ask itself for DNS resolution first.  If that fails, it's going to ask itself again (using the .12 IP).  And if that fails, it's going to fall back to asking... itself, using the local loopback IP.  It will never go ask Server B, or any other DNS server, for server B's IP.  

I assume both of these DC's are running DNS servers?  If so, change the network config for Server A to point to 192.168.1.11 and 192.168.1.8 for DNS, then try pinging server B by name and see if you get resolution.
0
 

Author Comment

by:PCGenieLA
ID: 40614391
Bingo! That did it.  Both ping and RDC by hostname now work. I can't imagine what might have change to make it stop working or why it would have worked with the previous setup. But anyway, many thanks for your help.
0
 
LVL 6

Expert Comment

by:Steve Whitcher
ID: 40614413
No problem, I'm glad you got it woking.  

Since my last response resolved your issue, I'd appreciate it if you would mark that post as the answer, so that your post will no longer appear in the list of unanswered questions, and I will get credit for the answer.
0
 

Author Comment

by:PCGenieLA
ID: 40614455
RR. Wilco.
0
 

Author Closing Comment

by:PCGenieLA
ID: 40614459
Many thanks again.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Many of us in IT utilize a combination of roaming profiles and folder redirection to ensure user information carries over from one workstation to another; in my environment, it was to enable virtualization without needing a separate desktop for each…
BIND is the most widely used Name Server. A Name Server is the one that translates a site name to it's IP address. There is a new bug in BIND (https://kb.isc.org/article/AA-01272), affecting all versions of BIND 9 from BIND 9.1.0 (inclusive) thro…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

738 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