Call of Duty 4 and Hamachi issues

[Major974]

im having trouble playing lan games over hamachi i have the same game version as my buddy and we have the same version of hamachi we have connected and played before with the same settings we have now but all of a sudden we can no longer ping each other on hamachi and we can not see each others lan games hamachi is allowed on both of our fire walls and i cant figure out what is suddenly preventing us from connecting anyone have any ideas?