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Hyper-V Event ID: 32, 12010 and 12570 - can't start VM because of Virtual Network Settings

Situation: We have Windows 2008 R2 running Hyper-V with two Virtual machines. After we re-did Virtual Network, we can't start those Virtual machines with this error: "An error occurred while attempting to start the selected virtual machines". The Event Viewer has these logs:

Log Name:      Microsoft-Windows-Hyper-V-SynthNic-Admin
Source:        Microsoft-Windows-Hyper-V-SynthNic
Date:          7/5/2011 5:01:14 PM
Event ID:      12570
Task Category: None
Level:         Error
Keywords:     
User:          NETWORK SERVICE
Computer:      HPV-DMZ01.EDU.local
Description:
'repewin' The switch port connection for "Ethernet Port" (3F7A0750-79FE-4584-B81C-40CBFDD20F68) is invalid.

Log Name:      Microsoft-Windows-Hyper-V-Worker-Admin
Source:        Microsoft-Windows-Hyper-V-Worker
Date:          7/5/2011 5:01:14 PM
Event ID:      12010
Task Category: None
Level:         Error
Keywords:     
User:          NETWORK SERVICE
Computer:      HPV-DMZ01.EDU.local
Description:
'repewin' Microsoft Synthetic Ethernet Port (Instance ID {3F7A0750-79FE-4584-B81C-40CBFDD20F68}): Failed to Power on with Error 'The system cannot find the path specified.' (0x80070003). (Virtual machine ID 99D06744-DDC7-43F3-BDFE-8D01558E47EA)

    
  Log Name:      System
Source:        VMSMP
Date:          7/5/2011 5:01:14 PM
Event ID:      32
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      HPV-DMZ01.EDU.local
Description:
Failed to connect NIC '99D06744-DDC7-43F3-BDFE-8D01558E47EA--3F7A0750-79FE-4584-B81C-40CBFDD20F68' to port '' on switch 'C36E587D-4', status = C000003A.

Fixed: The client has removed the original Virtual Network Connection and re-created a new one. If we open the Settings on the Virtual Machine, we see Ethernet Port Configuration Error. We fixed it by clicking on the Ethernet Port Configuration Error and select the new created virtual network as shown below.

 

 

 

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