I have looked at the file that you posted (which is the right way to get large amounts of information into a posting) and I believe that it is helpful. I see this type of error message quite a few times:
Apr 1 12:22:54.718: TAC+: Closing TCP/IP 0x641C40B8 connection to 10.
I believe in particular the part that says (check keys) is a clue. I believe that it indicates that there is a mismatch between the configuration on the router and the configuration on the ACS server. Check the configuration of the ACS server to be sure that it has an entry for 10.127.0.202 remote client and make sure that the key configured on the server is the same as the key configured on the router (it might be best to reconfigure the keys just to be sure that they match).
Thanks for your reply. The configs on the acs were fine and were checked multiple times. We restarted the acs service which resolved the issue for us along with the other routers with same issue with same acs.
Thank you for posting back to the forum indicating that you had resolved the issue and what you did that resolved the issue. It helps make the forum more useful when people can read about a problem and can read what was done that resolved the problem.
The forum is an excellent place to learn about Cisco networking. I encourage you to continue your participation in the forum.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...