Roundcube erreur

[srvordi]

Hello , My FRENCH
I come to ask for help cars roundcube I installed on my server and I have a connection problem when I go on http://mondomaine.com/webmail I put my email and CDM: Connection error the storage server ?? . I have already installed Postfix over Dovecot Bind9 Fail2ban Webmin etc ...

I get a good connect with the client outlook 2016

I thank you in advance
cordially