I changed the faulty column to SIGNED attribute but now that error does not appear anymore i have something else

"GET /SOGo/SOGo/so/user_name/preferences HTTP/1.1" 200 14051/0 0.245 55082 74% 564K
EXCEPTION: <NGCouldNotConnectException: 0x975d078> NAME:NGCouldNotConnectException REASON:Could not connect to address <0x0x97230b0[NGInternetSocketAddress]: host=localhost port=2000>: connection refused INFO:(nil)

Yes i noticed that the port which sould be 20000 is 2000 but my httpd.conf is ok with the right values in it and the sogo.conf as well.
I have no idea on what is the origin of this message in the log. Still have the proxy error 502 in despite of changing and restarting apache and sogod.

My guess is that you enabled Sieve and you don't have a managesieve daemon listening.

For now i added nothing like sieve or something else, the machine where sogo is installed is a kind of sandbox, a standalone server dedicated to sogo. Perhaps it is installed out of the box with CentOS ?
I will check what you suggested.

The postfix production server is remote.
I didn't yet installed IMAP on the remote server.
I will try to exclude IMAP from sogo.conf if it happens that sieve is not installed on the sogo server.

Thank you for your kind help.

In any case, show your .GNUstepDefaults.

Of course, here it is :

{
NSGlobalDomain = {
};
sogod = {
OCSFolderInfoURL = "mysql://sogo:pss@localhost:3306/sogo/sogo_folder_info";
SOGoACLsSendEMailNotifications = YES;
SOGoAppointmentSendEMailNotifications = YES;
SOGoAuthenticationMethod = LDAP;
SOGoDraftsFolderName = Drafts;
SOGoFirstDayOfWeek = 1;
SOGoFoldersSendEMailNotifications = YES;
SOGoForceIMAPLoginWithEmail = NO;
SOGoForwardEnabled = YES;
SOGoImapServer = mail.toto.eu;
SOGoLanguage = French;
SOGoMailDomain = "toto.eu";
SOGoMailingMechanism = smtp;
SOGoOtherUsersFolderName = "Other Users";
SOGoProfileURL "mysql://sogo:pss@localhost:3306/sogo/sogo_user_profile";
SOGoSMTPServer = smtp.toto.eu;
SOGoSentFolderName = Sent;
SOGoSharedFolderName = "Fichiers partages";
SOGoSuperUsernames = (
mouarf
);
SOGoTimeZone = Europe/Paris;
SOGoTrashFolderName = Trash;
SOGoUserSources = (
{
CNFieldName = cn;
IDFieldName = uid;
UIDFieldName = uid;
baseDN = "dc=toto,dc=net";
bindDN = "cn=manager,dc=toto,dc=net";
bindFields = uid;
bindPassword = "xxxxxxx";
canAuthenticate = YES;
displayName = "Addresses Partages";
hostname = 192.168.7.250;
id = public;
isAddressBook = YES;
port = 389;
type = ldap;
}
);
SOGoVacationEnabled = YES;
WOApplicationRedirectURL = "https://127.0.0.1/SOGo&quot;;
WOMessageUseUTF8 = YES;
WOParsersUseUTF8 = YES;
WOPort = 20000;
WOSendMail = smtp;
SxVMemLimit = 512;

};

}

Seems that you guessed right, i modified the file and it shows more verbose message in the logs, the fact is that it can't reach the smtp server.
So i think this bug can be closed, i'm sure it has something in relation with some locked ports on the remote mail server.

Thank you very much for your help.