> Not understand your question.
> 
> 4 packets were sent:
> 1. op_connect
> 2. op_attach
> 3. op_cont_auth
> 4. op_cont_auth
> 
> What is op_connect + op_attach?

This (.NET) 
https://github.com/FirebirdSQL/NETProvider/blob/master/Provider/src/FirebirdSql.Data.FirebirdClient/Client/Managed/GdsConnection.cs#L134-L135
 or this (Java) 
https://github.com/FirebirdSQL/jaybird/blob/master/src/main/org/firebirdsql/gds/ng/wire/WireConnection.java#L258-L259.

-- 
Mgr. Jiří Činčura
https://www.tabsoverspaces.com/



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