Depending on which firewall, if any, that you utilize, you may find the need to open up certain ports to allow NTL Studio to work properly. The methods for doing this are varied, as there are many different firewall options available. The ports normally used by NTL Studio and its associated SQL Server instance will be listed below:
SQL Server service: 1433 TCP
SQL Browser service: 1434 UDP
Outbound communication to iLink: 10000 TCP
Inbound Communication from iLink: Varies, default is 3002 TCP
Even between NTL Studio Management\Distribution and SQL Browser, sometimes a local firewall software including Windows Firewall may require the opening of port 1434 UDP so that SQL information can be detected. Likewise, 1433 may need to be specifically opened. This is especially true if trying to access your SQL Server instance and thus the NTL Studio Database from a secondary PC running NTL Studio. More information on this can be found in the following article: http://www.support.microsoft.com/kb/287932.
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