firebird2.1 - C# connection to firebird failed by IP, succeeded by hostname -

firebird2.1 - C# connection to firebird failed by IP, succeeded by hostname -

i have weird issue: c# connection firebird. @ string below, , check datasource parameter:

user=sysdba;password=masterke; database=c:\\example\\example.fdb; datasource=hostname;port=3050; dialect=3; charset=ascii;role=; connection lifetime=0; connection timeout=15; pooling=true; packet size=8192; server note=0 if datasource=hostname, works fine. if datasource=192.168.x.x, got: unable finish network request host "192.168.x.x"

can 1 help?

c# firebird2.1