Enable to etablish trust

Hello,

After a reinstallation of Backup Exec, i am unable to etablish trust. the error is 

I have done this :

https://www.veritas.com/support/en_US/article.TECH196158

Desinstallation and reinstallation of agent, desactivate firewall, use domain administor user but nothing woks.

How could i do more?

Thanks for help