Exchange 2007 SP3 upgrade error?

355LT1
355LT1 used Ask the Experts™
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I am upgrading my Windows 2003 Exchange 2007 sp2 SCR mailbox server to Exchange 2007 sp3 and have this error;

 "The 'MNSFileShare' path exists but 1 node(s) exist in the cluster. The majority node set with file share witness only works with two node clusters. My SCR is working fine and have a private and public LAN connection on each server. Any idea how to find out the cause of this error message?
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Re you applying the SP to the active (Source) or Passive (Target) node?
MS says to apply to the Passive (Target) node first
http://technet.microsoft.com/en-us/library/bb885043(EXCHG.80).aspx

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Commented:
I'm applying to the passive (target mode)

Author

Commented:
It is a CCR single node confiugration for SCR, it seems to not pass the SP3 requirments?
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