I am using the anyconnect client, my ssl connections never technically drop, however, if I have a session open, such as telnet, throught the ssl tunnel, it will randomly drop. I have keepalive enabled yet I still ahve this issue. The IPSEC client does not have the issue.
im my case, I identified two issue, first my ethernet interface had a duplex mismatch with my switch, second, the ACL on my Internet router was only allowing TCP 443 and not UDP 443. UDP is for the DTLS tunnel which works much better than the standard SSL tunnel.
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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...