I am using exactly this with my Fritzbox 7490. This locks down the internet for that device.
Thank for the quick answer. Than I will downgrade today and use this feature. I hope, that Logitech is not blocking that downgrade feature, before I downgraded my device…
Claudio
Yes, this is absolutely possible. Just give it a moment after downgrade and startup to initially connect (otherwise it won´t initialize completely). After your remote can connect (or it shows up in OH as online) you can block internet access via Internet -> Filter -> Listen -> Gesperrte Internetseiten (Blacklist).
I added these domains:
myharmony.com
svcs.myharmony.com
content.dhg.myharmony.com
logging.dhg.myharmony.com
sus.dhg.myharmony.com
Afterwarts I created a new access profile at “Zugangsprofile” with setting
“Filter für Internetseiten” enabled and “Internetseiten sperren” checked.
The last step is to assign this access profile to the harmony hub device in tab “Kindersicherung”.
The steps above are for a Fritz!Box 7390 with Firmware 6.85.
Best regards,
Rainer
Me too. It’s a “Fritz!Box 6490 Cable”. I also set “HarmonyHub” to “gesperrt” (=blocked).
→ No firmware updates from Logitch!
P.S: Check your DHCP settings for “HarmonyHub” if “provide always the same IP-Address” is activated!
Let’s see if this really blocks it. Also have the 6490 and blocked internet use completely for the hub. Hopefully logitech reacts and re-enables local access.
Logitech has released a special developer firmware. This one opens XMPP again. You can find it within the same tool used for the down-grade. For me it worked very well.
=> FIRMWARE TO ENABLE XMPP. FOR DEVELOPERS ONLY.
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Thanks for sharing. I’ll try later at home.
Looks like the community put enough pressure on Logitech 
For me it worked very well. THX
I had the same issue. I was running an older version of the MyHarmony application. You should download the latest version. It seems they updated the application framework to use .NET instead of deprecated Silverlight although it looks exactly the same.
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many thnx mate !!!
where this update can be seen? For me there is just a regular update screen
Ps.: found it, you have scroll all the way down
hehe i was surprised from Logitech’s kindness to allow the XMPP firmware…i was wrong 
after update i get this…
I am not getting that message after updating to .210 even after syncing my configuration through the desktop application.
Maybe websocket api now is not necessary.
@digitaldan what do you think about?? Should we upgrade to developer firmware 4.15.210 and use the XMPP again? Or wait until websocket api is implemented (by you) and then use official firmware 4.15.206?
For me it would be associated with a lot of effort or would be annoying to connect each time the hub via USB cable to PC getting a new “developer firmware” version!
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Thx! Saved my day 
Thank you so much for posting! Worked perfectly!
Agreed, upgrading is up to you. I plan on moving to the websocket connection, but I don’t have an ETA on when it will be done. I started last night and so far so good, but I will be completely re-writing our connection library. The good news is that it will be 90% less code, most of the logic was in managing XMPP messaging, much much easier using websockets, so I’m kinda excited to go down that route. Let’s hope logitech doesn’t stop this method as well.
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