Firebird: Unable to complete network request to host

I'm trying to connect to a remote Firebird database "test" (alias already added). It is not an embedded server, and is installed on VM with IP 192.168.1.147.

Here is my connection string:

User=sysdba;Password=masterkey;Database=test;DataSource=192.168.1.147

However I got an error:

FirebirdSql.Data.FirebirdClient.FbException (0x80004005): Unable to complete network request to host "192.168.1.147". ---> Unable to complete network request to host "192.168.1.147".

I've done some research on that but haven't got a clue yet. Some help needed. Thanks

My IP address is 192.168.2.108, and I can ping that server IP successfully

Make sure that

1. Firebird is running
2. Firebird is listening on port 3050 on the specified IP (or on 0.0.0.0)
3. Your firewall allows access to port 3050

For Linux, the Firebird port is closed by default. You need to modify RemoteBindAddress in /etc/firebird/2.5/firebird.conf from

RemoteBindAddress = localhost

to

RemoteBindAddress =

and restart service.

Make sure you have excluded tcp port 3050 in VMs' firewall.