Is this ASA configured in Multiple Context Mode. I think you are running into the limitation on the number of URL Block in Multiple Context Mode. AFAIK, the max blocks that you can configure in Multiple Context Mode is 16. Even though, the parser might show you upto 128, it will come back with an error if you configure anything more than 16. Atleast, this is what I saw long time ago.
In the above case, I believe the URL Filtering options are very limited. I am not sure if there is any feature or enhancement request filed to increase the value from 16 to something that is configurable. And, not sure if there is a way to tweak this value, meaning some hidden command, etc. Sorry, wasn't of much help.
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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...