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This is not error. Its feature of dbgrid

Joza

Monitor establishing of connectin on server side (when you open connecton during design time).

Tel us a version of DB server. Where is server? On your computer or in the net?
Probably this is not delphi or zconnect problem.
Can you normaly connect to server with some other program from yor computer?

If you have Zqueries in data module they must be closed and open then when you need them

Its good exaple for multitreading and good design .
I havent proper solution for TZSQLMonitor in treads.
But, its not big problem for me.

If you use treads, yes open a connecton per tread
Can you tell us in which case you use treads.
Generali if you use trasacitons in your stored procedures it is enought, no needs for treafds.
I need more informations about your databese/aplication design.

Mainly one TZConnection per aplication in a datamodul.

if you have TZConnetction per dataset and 10 datasets in your apl.
yuo have 10 real connenctons on DB serverve.
Imagine one aplication/user 10 connections on DB.
And imagine you have 15 users work with your program, 15X10 connectons.