Subject Firebird 2.1 server and long time of detaching ???
Author Bogusław Brandys

I encountered strange problem which occur only when closing
disconnecting software designed for older Firebird version 15 up to 2.0.
I've tested two Firebird accessing libraries for delphi under windows
and behaviour is identical. While connecting and disconnecting is fast,
closing application makes it stuck for a couple of seconds (5 and
longer). Because that happen only when there was a connection to
Firebird server during application run time I feel it may be related to
fbclient.dll unloading.

I'd like to ask if there is any reported incompatibility for Firebird
2.1 compared to older versions which could cause that problem.