Solved

Cannot Contact a DC from another DC

Posted on 2016-08-25
3
57 Views
Last Modified: 2016-09-06
Hi, I have a strange issue which hopefully you can help me with. I'm not sure if it's me being daft but I have 7 DC's all connected using the same model firewall/routers through IPSEC VPN tunnel at different sites, on different subnets and everything all talks to each fine, except the other day I found that from the DC01 I could not unc or contact DC03. I did a ping to both the NetBIOS name, FQDN and the IP but it would not contact the server. All other servers will talk to DC03 and DC03 will talk to all the other DCs including DC01, I can even ping from any client on the same subnet that DC01 is on and it finds DC03 no problem. I can even ping other things on the subnet of DC03 from DC01 and it will contact them without issue. It's just DC01 to DC03 one way will not talk whatsoever. This happened before and it went away over night but it's now come back with a vengeance and I cannot see what's happening!!?? Please any help would be most appreciated. Also wanted to mention that the Windows Domain Firewall is switched off.
0
Comment
Question by:Dave B
3 Comments
 
LVL 20

Expert Comment

by:CompProbSolv
ID: 41770539
Are you pinging successfully with both ipV4 and ipV6?
0
 
LVL 18

Accepted Solution

by:
Akinsd earned 500 total points
ID: 41770705
Interesting and strange.

There are several options to try. Try pinging after each step to see if problem goes away
1. Run ipconfig /flushdns on both DCs
2. Clear the mac address table on the distribution switch.
3. Run dcdiag /fix from any domain controller
4. Reset the NIC on both servers
- netsh winsock reset
- netsh int ip reset
0
 

Author Comment

by:Dave B
ID: 41781374
Hi,
I did the above and rebooted the server also which solved the issue. Hopefully it won't happen again.
Thanks
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

Suggested Solutions

#Citrix #Citrix Netscaler #HTTP Compression #Load Balance
If you are thinking of adopting cloud services, or just curious as to what ‘the cloud’ can offer then the leader according to Gartner for Infrastructure as a Service (IaaS) is Amazon Web Services (AWS).  When I started using AWS I was completely new…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

758 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now