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ERROR: Authentication Rejected: Clock skew greater than 300

I am trying to configure ASA VPN using Windows AD authentication. When the VPN client tries to connect the VPN, it receives Reason 413: user authentication failed. If I use test aaa authentication command, I receive "ERROR: Authentication Rejected: Clock skew greater than 300".

My configuration can be found this link: http://www.howtocisco.com/cisco/samples.htm.

Any suggestions?

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Re: ERROR: Authentication Rejected: Clock skew greater than 300

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