Recently met A strange problem, A Web site suddenly can not access, remote access server, use external address can't access, but it can be accessed by mapping the internal address of the firewall, on the server access other external websites are normal, also found that the presence of an internal address B server, remote login server B B external address to access Web site, but not be able to access A Web site of the external and internal addresses, and return to A server, with internal addresses to access A Web site of the running normal module, just can't use external address, inspection service at this moment, found that as long as to restart the World Wide Web Publishing the service, A Web site can access the external address, but the few hours appeared the situation above, and can only restart the WWW service, this is what reason, solve!