[SOLVED] Impossible to log in after a new installation of ProjeQtor

Please help immediately...

I share dnaton advise : this forum offers free support.
It is based solely on the good will of community members.
So requesting for help "immediately" will only delay answers .

Now, about your issue : a quick search in the forum for IIS gave many hints.
=> Possibly Timeout occured.
=> Possibly some modules are installed, but DLL used are not the correct version

What is sure is that things are not exactly the same from your first post (where you reported some "invalid connection" messsage") and your last login print screen (with message "an error occured...").

So now, what is important is to give more hints.
Follow "Before submitting issue..." process : www.projeqtor.org/fr/forum-fr/9-tips-tri...ore-submitting-issue
And provide all log files you can give :
=> Browser console log
=> ProjeQtOr log file
=> Apache (or other web server) Log file
=> PHP log file

Regards.

Important message is in ProjeQtOr log file :

Login error for user '+÷Ó·'

Login name is not decrypted, so you may have encryption / decryption issue.
1) Clean browser cache to be sure you have correct version of javascript files
2) Encryption DLLs may be in cause on you PHP server (IIS). It is major to have IIS log file to help you.