Same thing for some people on 1364. They see this screen in browser:

People tried different browsers, cleared cookies, cache, flash also didn't help with its reinstall and 1 mill other regular troubleshooting steps also did not help.

For me its all working nice and smooth but for some people it is not. Some are able to play from client but its laggy there for some reason and 3v3 always says that they cannot connect so another person needs to take lead always instead of them and only after that 3v3 works for them. Refreshing game does not help.

as i saw, only on google chrome deosen't work, tryied with different browser and works

For the people I asked - none of the browsers work. Only client but laggy and their internet is fine.

Hi,

I have been informing this issue from the start of this month. I have lost so many rewards, my daily cps and events. Until date they have not fixed the problem. The game never works in Mini client & browser. Even today, I have logged but its all vain.

I get that same error as OP on Edge but not on Chrome. It's weird cause i normally play on Edge (was on it yesterday) and when I went to log on an hour before Training Grounds, that's when that error starting popping up. No idea why the error started popping up all of a sudden.

Hello,
I was unable to replicate your error with Chrome and Miniclient. It seems you were able to get the game to work on other browsers and the Miniclient. Therefore, the problem most likely stems from your personal Chrome settings. I would suggest simply playing the game using the Miniclient or a different browser, but if you insist on playing on Chrome, you might start but uninstalling and reinstalling Chrome, which would help by returning you to the default settings.
Thanks!

now doesn't work on other browsers too, only with client i can play

same issue for me its gonna be month and still the same problem and no further developments. I login daily to see whether this problem has been resolved or not but no change whatsoever. Please consider this problem seriously because iv lost all activity, events, etc this month because of this issue.

this just happened to me on S1416. tried several workarounds, with no success. i've spent good money on this game, get it fixed

same for me, as for the suggestion of using Client, client never worked for me, always had a blackscreen, tried numerous times to un- & re-install, always without succes...

This is happening to a lot of people, it snot some personal issue, dont talk rubbish please.

After December 2019 ( you probably have seen massage already ) Flash is not being supported which means slowly with time, browser will stop to work with it.

So according to

https://www.adobe.com/products/flashplayer/end-of-life.html

until 2020 we will be able to use flash on most browser. After that it will be simply banned, or wont work at all due security issues

Personal research info, complacently unofficial

Glaedr

started happening for me too as of today

exactly the same as the others and happens across all browsers

"The webpage at https://naruto-en-gmt.oasgames.com/main.html ..........= might be temporarily down or it may have moved permanently to a new web address."

Same here

same

My browser worked perfectly fine with game today morning, but now it doesn't...

Sadly its a cross-browser issue, while other flash games still work for me on Kongregate, only Naruto Online fails to boot

edge still doesn't work. chrome worked fine this morning now that ain't working

Ok, a bit far fetched but Win 10 + Nox emulator + Puffin browser actually works. :DD

You need to set Puffin to force desktop version of sites (website preference setting),
so emulating desktop on mobile while emulating mobile on desktop solves the problem - but its far from ideal.

Hello, the devs have been working on this. They have requested that players ensure they enable TLS protocols 1.1 and 1.2 on web browsers. Please let us know if you still have issues after doing so.

https://engagingnetworks.support/knowledge-base/manually-enabling-tls-1-1-and-or-tls-1-2-protocols-on-web-browsers/