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FlavioV reported a problem:

Hello
Seems like I need your help again
Every time i try to change avatar at my forum it shows "Access denied user changed". It happens with any member.
I checked uc_server and there's no application listed. Maybe a problem at installation?
Please help me to solve this, without losing any data (my forum is running since 2 weeks ago).
Tell me if you need any access to the forum.
Thanks

Checked.
This error message going from UCenter server.
UCenter compare data from UCenter by Auth Key.
I think, your DZX Auth Key differs from the Auth Key that is set in UCenter for your Dzx application!
Check and compare this values:
1) UCenter Admin -> Applications -> DiscuzX -> Edit -> Connect Key: XXXXXXXXXX
2) Discuzx/config/config_ucenter.php -> define('UC_KEY', 'XXXXXXXXX');
This values must be equal !

FlavioV:
there's no application listed in UCenter, despite being everything working (except for the avatar)
is there any way to solve this problem without losing user data and threads?

1) Copy to clipboard Auth Key from:
Discuzx/config/config_ucenter.php -> define('UC_KEY', 'XXXXXXXXX');
2) UCenter Admin -> Applications -> Add New Application:
Fill the form!
Application Type: DiscuzX
...
Connect Key: Paste it from clipboard!!!
...
Login all Application at the same time?: Yes
Receive Notice?: Yes
[Submit]

FlavioV:
It worked!
Also needed to change the application ID at admincp to 3 (since it's the ID at uc_server).

Thank you!

alimjan

it is good toturial.