It is OK for the sensor to not be able to ping its own interface in ROMMON mode. Based on the output, it looks like the sensor is able to ping the server at 192.168.2.58. Are you having issues with the TFTP process? What happens when you issue the "tftp" command?
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...