SSL Certificate issue with my dyndns.org domain

Try your browser to:
http://MYEXTERNAL.IP/
and
https://MYEXTERNAL.IP/
and
http://MYEXTERNAL.IP:443/

Which look similar?
Which return anything?

Nothing return all of them
Problem loading page

Well…
I think we hit a wall.

My best guess is that your HTTPS section is missing the “turn SSL on” command and is serving HTTP via port 443.
But we can’t confirm nor deny anything at this point / from this vantage point.

Try connecting the second system back to the same LAN as the Vaio.
And hit MYINTERNAL.IP instead.

Give some minute sir , sorry I will be back soon

So system is back to the same network as vaio and both http & https 192.168.1.26/nextcloud are served

openssl shows more output?
[more like google?]

yes correct
its same like google output

Then maybe your router is messing with things…

yes, I am imaging something like this

Really appreciate for your help, regardless if we have results or not.
Thank you very much

Best of luck to you and cheers from Miami :beers: