Database connection failed communications link failure due to underlying exception!

(1) Have encountered this problem today: when using MyEclipse in DB Browser connection MySQL appears Communications link failure due to underlying exception! issues
Service is open, use SQL command can also be executed, but after a while can not connect to appear above the problem;
(2) hurriedly Baidu a bit, Baidu on the way of the great God method is mainly
A) due to the length of the connection of MySQL, when the time limit MySQL will automatically disconnect, the solution, there are many methods on the Internet, there is no explanation;
b) My solution is to "shut down the firewall", this evil firewall, shut down and then it's okay
(3) If the various methods on the Internet have been tried, or not resolved, do not try to shut down the firewall.

Database connection failed communications link failure due to underlying exception!