Hello,

can you please verify via Steam that you have all files uncorrupted and up to date?

https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335

Thank you

Steam is up to date
it's verified : no problem

Thank you for quick response.

Could you please try to run Arma as admistrator? If that does not help,
please try to create another profile ingame [Main menu > Configure > Profile] as it may be problem with user-saved scenarios.

Thank you, please let me know

Arma is running as adminnistrator
another profile is created
i can log onto some server (empty) but still can't access to my favorites ones
thanks for helping me

Forgot to tell you that i use Play Withsix to install the mods.

I am sorry to say so, but you may have to uninstall and clean up your Arma and reinstall it from Steam again.
It seems that the mods are the source of your trouble, could you please try to connect with fresh installation and tell me afterwards?

Thank you.

ouh lalala , i have to download again all ARMA 3 ????? really???? one week of downloading (512K DSL) . is there any possibility to install back from the files stored into steam folders?

You can try and delete all files that are not official from Bohemia Interactive. However, if any of the official files is modified [and Steam has not detected it], you will need to run a clean installation.

ok i am trying to backup first the ARMA 3 by steam and try to reinstall it. i will be back to you ASAP. Thanks for your time.

it's probably the signature verification, which is enabled on about 60% of the servers

according to your .rpt file you've got 2 files loaded which aren't part of the default arma 3 install (at least not part of my install)

without any warranty - if your pc explodes it's not my fault:
1.) remove (backup/move them somewhere outside of your arma 3 install)

C:\Program Files (x86)\Steam\steamapps\common\Arma 3\dta\languagecore.pbo
C:\Program Files (x86)\Steam\steamapps\common\Arma 3\dta\languagecore_h.pbo

2.) verify your arma 3 install with steam
3.) try to connect to some servers

Ok Will try right away

tried but still the same message "Echec de la connexion" connexion failed

hello
it's me again, i found that everything is going right when i connect with other games programs (Battlefield, America's Army, DOTA2...) But it's only with ARMA 3 and 2 that i can connect to multiplayer. every times it's the same error messsage "connection failed".
Arma is clean installed.
Arma is up to date.
Files are verified.
no other addons are installed.

hello ICEMAN i know that you have a lot of work resolving problems. What about mine?