Solved

Some virtual machines unable to connect to network and internet from Server 2008 R2 w/Hyper V

Posted on 2010-08-24
11
601 Views
Last Modified: 2012-05-10
virtual machines are not able to connect to network or internet today but were able to just last week.  this does not apply to all of the virtual machines, one continues to connect out
0
Comment
Question by:dmaxIT
  • 6
  • 5
11 Comments
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33512510
Did you recently update or modify your Hyper-V? Any ISA Servers in the network, check the configuration, it might be blocking access.

What are the guest OS's running on the Hyper-V?
0
 

Author Comment

by:dmaxIT
ID: 33512569
Not sure what may have changed - there are 2 users with access and creating guests - I think someone did something, but I cannot see any difference in network setup between guests.  There are no ISA servers to contend with.  The guest machine(s) are XP SP3.  Thanks for any ideas
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33512664
Check any recent Service Pack Installation, Check the guest tools are installed and up-to-date (try reinstalling the guest tools), Check the Host Firewall Configuration, try disabling it and test.
0
 

Author Comment

by:dmaxIT
ID: 33514270
no recent SP installs on either Host or Guest.  Guest Services reinstalled. No firewall enabled.  
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33517006
I want you to check the MAC address of every machine and tell me if they are the same.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Author Comment

by:dmaxIT
ID: 33520699
owner of project machine reports that none of the virtual machines have the same MAC
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33524154
Remove the Virtual Network Adapter while the guest OS is running, and add it again, also if you are using a bridged connection on the Virtual Network Adapter, check your network switch configuration, perhaps there is a limit on the number of MAC addresses per Network Port.

Also Try using a Host only network connection on the Virtual Network Adapter, if the problem is solved in the guest OS, you should check your network set-up.
0
 

Author Comment

by:dmaxIT
ID: 33529961
we have determined we can create a new XP virtual machine from "scratch" and it will connect to the network and beyond without any problem - any new virtual machine created from an existing machine "template" will not be able to connect -- the owner of the machine contends this was not an issue up until this week.
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33530028
So the problem is not in the hyper-V or network, it is in the virtual os,
do you have any backups or snapshots of the virtual machine, when things worked.
0
 

Accepted Solution

by:
dmaxIT earned 0 total points
ID: 33535014
OK, got to the root of the issue -- The host machine is in a very small segment that has been configured for distribution via DHCP.  If the machine owner shuts down a running virtual machine and brings up a different one, it will connect out successfully.  If she powers up another virutal machine at the same time, it will not connect out. She can power off the working one and the 2nd one will now connect out.  The IP range is not one I really want to allow DHCP for - not sure why this small group was allowed in the first place, but it's there.  Anyway, I have some direction to look at for a long-term resolution, but some decisions to be made .....  Thanks for all your ideas and suggestions
0
 
LVL 4

Expert Comment

by:Geek_Nabil
ID: 33539363
Glad i could helo you realise your problem.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

The way I use Experts Exchange to assist me in analyzing and diagnosing a problem is I first enter a Verbose Question at Experts Exchange like: Office 2007 will hang when opening and saving files I then launch WordPad (any text editor will do) an…
INTRODUCTION The purpose of this document is to demonstrate the Installation and configuration of the Data Protection Manager product. Note that this demonstration was prepared on the basis of Windows OS is 2008 R2 and DPM 2010. DATA PROTECTI…
This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
Windows 8 comes with a dramatically different user interface known as Metro. Notably missing from the new interface is a Start button and Start Menu. Many users do not like it, much preferring the interface of earlier versions — Windows 7, Windows X…

863 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

18 Experts available now in Live!

Get 1:1 Help Now