There is no code for UserPassword data segment in BuildDpb method

[MagGr]

Name space FirebirdSql.Data.FirebirdClient class FbConnectionInternal BuildDpb(DatabaseBase db, ConnectionString options)

There is no code for UserPassword data segment. Only user name is send to Dpb I think need add this if (!string.IsNullOrEmpty(options.Password)) dpb.Append(IscCodes.isc_dpb_password, options.Password);

[mrotteveel]

That is intentional, as authentication is handled elsewhere.

[mrotteveel]

That is, using isc_dpb_password is only when using legacy authentication, and even then, using isc_dpb_password_enc is the better choice. But since Firebird 3.0, a different method is used for exchanging authentication information.

[mrotteveel]

In any case, you may want to look at FirebirdSql.Data.Client.Managed.Version10.GdsDatabase which does add it to the DPB, but all those methods which do use it are overridden in Version13 to use the new mechanism (and IIRC the Firebird .NET provider only support Srp on Firebird 3.0 and higher, not Legacy_Auth).

[MagGr]

I use Firebird 4 with Legacy_Auth and it nessary for me personal. Is there another sutiation when this add to code biring a promblem?

[cincuranet]

Use older version of provider. But you should really update to using SRP.