I've deployed an application on #2 server. It worked well for several days. But a few days ago I found that there are some errors with it. I checked it and found that that was due to API connection timeout to api.feijipan.com and up.woozooo.com. I asked their customer service and they all said that they didn't block the connection from #2 server's IP. So Are you blcoked the connection?

    yucho I don't see any traffic being blocked from the server s2.serv00.com to the specified hosts. You can verify this using the MTR tool.