I2P-over-VPN doesn't work well and you shouldn't do it if at all possible. We report symmetric NAT because the VPN is doing symmetric NAT stuff. If you have to use VPN, and it works, then ignore it saying symmetric NAT, and have fun.

The only time I get login popups is after the brower or computer restarts.

Except susimail, it works differently because it's not just the console password, you have to put in your email name/pw. I believe the susimail idle session timeout is 24 hours.

Here's my version I did a few years ago, for Linux. Never got around to making it perfect enough to include in our PPA/Debian packages, but may be good enough for you.

https://git.idk.i2p/zzz/i2psnark-launcher

LS2 SRV is about service discovery; it's not about any particular implementation of a service. I don't know how we build anything "on top" of BDS which is an external SAM app in Go. But to publish an LS2 SRV, we'd have to simply define a I2CP/SAM config option. Proposal 167 handwaves at th...

Also, ensure you're running the latest release, we have had several fixes on firewall-detection, ipv6, and related things in recent releases.

Mostly true in practice; however, UPnP does support IPv6 port forwarding ("pinholing") if it supports "IGD2". The good news is that we've supported IGD2 pinholing for a few years now. The bad news is that most UPnP devices out there don't support IGD2. In rare cases the device ma...

For distributed releases we use Java 8 as that is the minimum requirement. For your own use only, any JDK and JRE, 8 or higher is fine, may as well use the latest to get the best performance. I don't know what you mean by "the debugger" or what that is. Most devs do not use an IDE or a &qu...

Fixed in dev build 2.5.2-6. This was a display issue only; internal limit was correct.

thanks for the report, I'll take a look at it

My quick DNS SRV-style proposal:

http://i2p-projekt.i2p/spec/proposals/167