We have a 3005 concentrator that has been working fine for nearly 2 years. 4 days ago, users have been unable to connect to and access the network using the 3.5 Client and the IPSEC over UDP setting. If we have them change to IPSEC over TCP, they connect fine and can access resources. Nothing has changed on the concentrator. I know because I am the only one who can change settings and I have been on vacation when the problems (still am). What could have caused this sudden inability to access network resources?
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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...