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Your firewall or antivirus is blocking it then or your router does.
Or some malware or similar bad virus program installed a proxy server which your browser/standard windows system uses.
Search for your windows version and proxy to find out how to disable a proxy server.
Scan your PC for malware and virus infections.
Anything I can find about this so far got to do with these threads, or I can remmeber (but not find anymore :-( ) some info about a java changes which set your java to always use ipv6 as connection settings. Try to search for java and ipv4 to find out how to enable ipv4 and ipv6 protocolls for the java applications so both can pass through java network packages again in java applications.
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