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ISCSI in Hyper-V - does not work without internet connection

Posted on 2011-09-22
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Last Modified: 2012-05-12
Good evening,

I have Windows Server 2008R2 with several Windows Server 2008R2 VMs in Hyper-V. Hyper-V guests have internal network which are bound to my external (host network) via RRAS.

One of the guests is domain controller with iSCSI target installed. Other guests - some are members of domain, some are not are - are iScsi initiators. Everything works fine as long as external host network is connected to internet (or perhaps have IP address - did not test no internet connection with static IP option) when iScsi target is trying to connect/login to initiator. If host network is disconnected (e.g. guests don't have internet access), those stuck on Reconnecting stage. If I disconnect from internet when targets are connected, everything works fine.

I tried to create another private network for iScsi but it did not help.

Thank you!
P.S. This is obviously not the production setup - I have lab on my laptop.
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Question by:dwkor
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OliverLo earned 2000 total points
ID: 36710576
Hi Dwkor.

I understood that you're having a problem with you iSCSI connections between your client and your iSCSI target (also DC). The problem is occuring if:
- the iSCSI client are trying to connect to the target while the external network is disconnected
If the iSCSI client are already connected and the external network is disconnected then there is not problem.
This observations tend to show that the probleme occurs during the discovery/authentication steps performed to initialize the iSCSI session.

1. I don't understand why the external connectivity can impact if you configured the iSCSI network as completely private (it should then have no interaction with the physical adapters...)
2. Did you configure iSNS to resolve the name of the iSCSI target? If yes could you please configure a simple session where you specify the portal IP and request connection to the target when the external network is disconnected?
3. Do you have any error messages in your application system logs when the connection to the target is failing?

If possible provide me with more details regarding your configuration...
Thanks.
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