Is SMB encrypted over the WAN on windows server 2008?

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i setup windows 2008 server in rackspace's data center , using smb share files on wan client computers. wondering if smb automatically encrypts end end.

hi,
 
encryption 1 of new smb 3.0 security enhancements in windows server 2012 rtm. can enabled on per-share basis, or enforced shares on server. smb 3.0 uses aes-ccm [rfc5084] encryption algorithm, , provides data integrity (signing).
 
take advantage of new feature, smb client , smb server must support smb 3.0. smb 3.0 protocol introduced in windows server 2012 , in windows 8, smb encryption cannot used in windows 2008 server.
 
more detailed information, refer article below:
 
encryption in smb 3.0: protocol perspective
http://blogs.msdn.com/b/openspecification/archive/2012/10/05/encryption-in-smb-3-0-a-protocol-perspective.aspx
 
regards,

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