Those two are NOT the same, even though it seems that way. pdm location command really shows the logs of the ip addresses from where PDM was accessed at least once. "http ip_mgt " really allows the ips of the mgt station that are allowed to access the PDM. So, with http command you can allow the host/network to access PDM, and the pdm location basically shows the log information.
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...