Cisco Secure Acs Clock Skew Error
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Experts Exchange > Questions > Cisco ACS server clock skew error Want to Advertise Here? Solved Cisco ACS server clock skew error Posted on 2011-10-05 Network Operations 1 Verified Solution https://supportforums.cisco.com/discussion/11579526/acs-52-clock-skew-error 4 Comments 3,372 Views Last Modified: 2012-05-12 Hello all, i have a Cisco ACS server configured in a virtual environment - V-Sphere. The ACS is used for authenticating wireless and VPN users RADIUS. Also it is used for for authenticating netork admins logging in to routers and switches etc... TACACS is used for this. The ACS talks to Active directory to https://www.experts-exchange.com/questions/27381023/Cisco-ACS-server-clock-skew-error.html authenticate the users. Every so often, maybe every 3 months, people are not able to authenticate. I log on to the ACS GUI page, and perform a connectivity test to AD. It fails and says there is a clock skew error. i then have to manually SSH to the ACS, change the clock and then restart. the funny thing here is, the clock on ACS has to be 1hour and 10 minutes behind the domain controller for the link between ACS and AD to be successfull. If i set the correct time on the ACS then the connection actually fails - clock skew error. does anybody know a fix for this? maybe someone has seen this before? its even more frustrating because, even though all my NAS devices such as wireless access points, VPN concentrator etc... are configured to use an alternative server for user authentication, this other server is never attempted becase the wireless access point for instance can still see the ACS. Therefore the secondary authentication server is never attempted, and the user just fails authentication based on th
May (and several months before), it might seem like madness to squeeze another UK show into the diary just days after teardown... but that's how we roll. Unifi Wireless Implementation Replacing all the https://community.spiceworks.com/topic/579625-cisco-acs-clock-skew-error stand alone WAPS with a Unifi system from Ubiquity. Opening new branch Client doubled in size and needed to expand into brand new building, but had no idea what they needed from an IT perspective. IN THIS DISCUSSION Join the Community! Creating your account only takes a few minutes. Join Now I see in my 5508 that it shows I'm not connected to AD. I test the connection and receive (clock skew error). I can cisco acs see that my WLAN and ACS times are within 7 seconds apart. My DC time is 5 mins faster thought. I haven't had any issues like this in the past 2 years. Anyone seen this issue and have a way to resolve it? Reply Subscribe 2 Replies Thai Pepper OP stevemoores Sep 9, 2014 at 2:58 UTC Multiple computers will never keep good time, they will always drift over time. Even cisco acs timezone your electronic wrist watch will gain or lose a few seconds a day (and the clocks in computers are no better, usually much worse). Consider syncing everything with NTP. See: http://www.pool.ntp.org/en/ 0 Jalapeno OP Nick Koiter Sep 9, 2014 at 3:29 UTC Synch your network, frank5898 wrote: I see in my 5508 that it shows I'm not connected to AD. I test the connection and receive (clock skew error). I can see that my WLAN and ACS times are within 7 seconds apart. My DC time is 5 mins faster thought. I haven't had any issues like this in the past 2 years. Anyone seen this issue and have a way to resolve it? If your 5508 can get to external, then sync from external. You don't have to specify the source interface, but I prefer to do so. Then choose your 3+ time sources (internal or external): ntp source GigabitEthernet0/0ntp master 2ntp server 64.250.229.100ntp server 128.138.140.44ntp server 132.246.11.229 prefer Typically, you should have a specific NTP server on your network or use your gateway router to update externally from NTP pool. http://support.ntp.org/bin/view/Servers/NTPPoolServers Point your DC to update from that router and use your Windows W32tm with DOMHIER, built-in services to update your network. 0 This discussion has been inactive for over a year. You may get a better answer to your question by starting a