Problems with research

@Marcus150:
http_listener_port must always be completed
http_listener_port = 0 is not correct
http_listener_port should use your main region's port

This is also required for jsonSimStats .
(see :http://opensimulator.org/wiki/UXSimStatus)

@Foto50: OpenSimulator is currently not IPV6 ready

I just did as you advised, I filled in the line relating to http_listener_port = in the [Network] section of OpenSim.ini of each simulator, now no simulator is registered 0, before at least 3 were registered

@Marcus150: Can you disable IPV6 from your servers and use a IPV4 on your Region.ini ?

i just disabled IPV6 on Robust server, it's windows server 2019, i hope i did it right, and then i disabled them on others who have ubuntu, but nothing changes

Have you checked in your database that there is no more IPV6 address now?
If you see any, clear the entry and restart your simulator.

on DB Robust the simulators are all registered with their port that I assigned in http_listener_port = but from the console of the terminal OpenSim.exe gives me this error now:
[jOpenSimSearch]: initDataUpdate returned error: Host ***. ***. ***. *** with port 9000 -9001-9002-9003-9004 not registered!
the other ports I added it myself the message is the same for all simulators

but the IPV6 addresses were not even before, there were only IPV4, it was jopensim that in debugging denied entry to an IPV6, now I try to restart everything even the Robust server

jOpenSIm database "opensim_search_hostsregister" should contain IPV4 addresses only.

earlier when he had only registered 3 simulators he had only IPV4 of the three simulators