I think this may be a known bug with the version you're running - I recall that at one point 877's weren't supported, and it seems that you're running a pretty old version. I would suggest upgrading to 3.2.2 if possible. (But, of course, after following appropriate procedure, going through TAC, etc.)
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
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...