Probably there is a bug in TestNG Eclipse plugin (22.214.171.12430607_0745), try an other version (e.g. 126.96.36.19921120_1820)
before running my test in debug mode, i open the debug view, and remove some breakpoints (such as some remaining on NullPointersExceptions, and Sockets)
Don't give up yet. Our experts can help. Paste your full stack trace to get a solution.