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A: To be able to lookup the country when using a domain that does not contain any country information in it (like .com or .net) JoomlaStats does an fsockopen to the whois.ripe.net database on port 43 (WHOIS service).
Solution 1:
Make sure your system (the webserver JoomlaStats is configured on) can open an outgoing connection on port 43 to whois.ripe.net
Solution 2:
Disable the whois feature (JoomlaStats 'Configuration'->'Common' Tab). JoomlaStat works fine, however less visitors wil be related to their country.
Note:
It could be that the ip2country table never will be filled if you can't enable the whois feature (and will result in a message on the Info section). Although you won't be able to detect where some of the visitor are visiting from, this won't harm your data. A developer is currently investigating if we can provide a solution for resolving the visitors country for users that aren't able to use the whois feature (on systems having port 43 blocked).