[quote]Does the 4.1.1. version contain changes about OCI connection process ?[/quote]No.

[quote]Would it be possible, in your opinion, that the BDE is using an older connection mode (if any..) ?
Something like oci7 or oci8 .. ??
We are using BDE511 sqlora8.dll has the timestamp 16/6/2000 6.12[/quote]This seems the most likely culprit. I'm not sure how this driver uses OCI though.