I've had similar issues after logging in, with certain applications. It seems the problem was MTU related. I'm not sure why, but after I upgraded those clients to the newest VPN client (4.0.2) everything worked fine.
If you don't use the VPN client, you might try changing the MTU on the routers and see if that helps. Maybe to 576? If doing it remotely, make sure you do the router at the far end first.
It does sound possible. However, I cannot be sure. I know (like you, I'm sure) that it usually takes nowhere near that long for XP clients to authenticate, so it sounds more like a network issue. I would try the MTU. If this is not over the Internet, try 1300. I believe that's what Cisco recommends for IPSec connections.
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
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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...