July Android Patch did not resolve the issue. So while I was checking everything IPv6 related I noticed that the DHCPv6 server was on and issuing addresses ("Auto IP range" was enabled as well). As I know that I never enabled it (I rely on SLAAC stateless), I disabled it again, clicked on advanced, browsed around, and coming back it was enabled again. wtf? ;)
Having it disabled once and for all, my IPv6 problems MOSTLY seem to be solved. HOWEVER yesterday for a whole night the complete LAN was without IPv6, fixed itself this morning. Something's definitely broken

I found that the router didn't seem to follow the firewall rules. Try running a online port scanner such as this one http://www.ipv6scanner.com/ . The issue was strange I couldn't put my finger on it. Filter sets >1 seemed to have an impact. Just when I though specifying specific hosts rather than "any" fixed it, something else would break.

Some IPv4 services were also broke as others have pointed out. I tried recreating config from scratch, but issues would crop back up. Spent way too much time with the inbound connection down. Ended up downgrading back to 3.8.8.2_BT, restored config backup and all is working again.

I keep checking for a revised 3.8.9.2_BT firmware.... nothing yet. Am missing those country filter rules

Have you guys reported your problems to Draytek through their support channels bearing in mind that they don't officially read this forum? The reason I ask is that I reported my problems over 3 weeks ago and they've kept very quiet about what they've found/not found and obviously the more people who report it, the greater chance they might fix it

Just reported... Trouble is I've downgraded back to a working firmware version and thus cant replicate the issue, nor can I explain what the issue is. i've done my best to describe what appears to be a "funky firewall issue"

I'd like to think support are working on these issues already, but then I'd also expected them to have pulled the "funky" 3.8.9.1_BT firmware from the downloads page............... ?

They were pretty good when i pointed out the missing country filter rules.

lets see how this goes.. Will post update if I get response

TighterThan wrote: Just reported... Trouble is I've downgraded back to a working firmware version and thus cant replicate the issue, nor can I explain what the issue is. i've done my best to describe what appears to be a "funky firewall issue"

I'd like to think support are working on these issues already, but then I'd also expected them to have pulled the "funky" 3.8.9.1_BT firmware from the downloads page............... ?

They were pretty good when i pointed out the missing country filter rules.

lets see how this goes.. Will post update if I get response

Got an email from them yesterday to say that it's been in the queue and that they're just starting to test it. I've upgraded and downgraded the firmware 3 times now and each time the problems come back straight away. Support gave me the option of them loading it on a router in the lab or me having re-upgrade again and them to test remotely which I politely declined because it breaks my RDP Gateway which I use most days while away from home, I did say I'd upgrade again as a last resort if they can't replicate the problem

Look like 3.8.9.1 has some major issues;

Here is my entry for the 2860ac
https://forum.draytek.co.uk/viewtopic.php?f=14&t=22466

Raised ticket, fed logs back to DrayTek as requested - nothing