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[3.3.x] Support Forum • "The submitted form was invalid." Solved

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I installed a second instance of phpBB in order to update and solve a digest 500 error.

When first I tried to login with the administrator credentials, I got the message "The submitted form was invalid..."

Checking past posts here, I discovered that switching to Chrome worked for one developer. And, lo, it worked for me. The problem seemed to be state retained by FireFox.

On FireFox, I was able to login after these steps: I cleared the phpbb cache, cleared the FireFox data cache, and restarted FireFox. I did not clear the phpbb.com cookies, but perhaps they were cleared by the FireFox restart.

Fred Hansen

Statistics: Posted by ZweiBieren — Sun Jun 15, 2025 8:44 pm



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