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Error checking for jar updates.
I can't play any games because of this message. I can't see any games versions and if I click launch, cilent will show this…I have checked my internet connection and firewall but it was no good…
It may causes by my country? I live in China……But the other players(like some video uploader on bilibili)can use the cilent and launch game…
(I am Chinese…So if there are some grammar mistakes or spelling mistakes and you don't understand them……You can ask me what did I mean…)
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Hello,

Make sure you are not using any VPNs (like Hamachi) and make sure to disable your antivirus or if your antivirus has an option to whitelist programs, then make sure to whitelist Badlion Client.
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Thanks.
I tried. At least it's fine now…But I don't know whether it will break next time…
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It's no good now…

I tried to reinstalled Badlion again.Then it can launch for 1 time. But next time it can't launch again…
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And….
Should I use VPNs…I live in China…
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If you are sure your antivirus and firewall are not blocking Badlion Client connections, submit a bug report through the launcher by clicking on "Submit Bug Report" at the bottom of the launcher (https://www.badlion.net/wiki/how-to-submit-bug-reports). It will send us your logs and the tech support team will look into the issue.
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I am having this same issue today, but I can’t even submit a big report because I get an error when I do that too.
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@Xyz_xyz_xyz_xyz If you are getting the 400 Bad Request error, then relog on the launcher and forums.

Before you submit a bug report, disable your firewall and antivirus and then try launching Badlion Client again. Make sure you have a stable internet connection and make sure you are not using any VPNs.
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same ubonzu
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If you have submitted a bug report through the launcher, please be patient.
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Same issue here.
Windows Defender Firewall is completely turned off
I don't have any VPNs
My internet connection is stable and quick
When I try submitting a bug report, it just says "Error 400 Bad Request: Failed to Authenticate"
Update: I can submit a bug report now but still can not start the game
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same issue here, yesterday everything was fine and i didn't change anything since then so.


edit: fixed after restarting client 10 times lol.
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q4f wrote

same issue here, yesterday everything was fine and i didn't change anything since then so.
Same for me here, i just turned off my computer and the next day i see this
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For me restarting the client a few times worked eventually so you could try that.
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Same Problem here.
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Same Problem
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oh wait, after restart the launcher about 10 time i can play again LOL
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