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I have used ProcMon.exe to see what happens to my application when there is no internet. My application is an electron application that makes use of websocket to connect to backend service resides in other computer.

FYI, the example of websocket address is ws://10.5.14.72:8080/Model.

AFAIK, HTTP request from websocket will go through proxy server if there is one exist(please correct me I am wrong).

FYI, when there is no internet, the application reacts very slowly as it keeps reconnecting to some unknown address as shown in ProcMon.exe which i believe were proxies but i can't find in internet options. Below is the details:

TCP Reconnect x.x.x.x:50074 -> 203.208.39.198:https    SUCCESS
TCP Reconnect x.x.x.x:50075 -> 203.208.39.198:https    SUCCESS
TCP Reconnect x.x.x.x:50077 -> 203.208.39.199:https    SUCCESS
TCP Reconnect x.x.x.x:50078 -> 203.208.39.199:https    SUCCESS
TCP Reconnect x.x.x.x:50077 -> 203.208.39.199:https    SUCCESS
TCP Reconnect x.x.x.x:50078 -> 203.208.39.199:https    SUCCESS
TCP Reconnect x.x.x.x:50080 -> 203.208.39.193:https    SUCCESS
TCP Reconnect x.x.x.x:50081 -> 203.208.39.193:https    SUCCESS
TCP Reconnect x.x.x.x:50080 -> 203.208.39.193:https    SUCCESS
TCP Reconnect x.x.x.x:50081 -> 203.208.39.193:https    SUCCESS

These connecting attempts happen for few minutes before it finally reaches the target address. So, can I know whether these 203.208.39.xxx:https addresses represent proxies?

vincent911001
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  • I can tell you that the machine operating at 203.208.39.193 is either operated by google or proxying your connection to a server operated by google. – David Schwartz Nov 02 '17 at 09:11
  • @DavidSchwartz, can I know how do you know it was google? FYI, the client's site is in China – vincent911001 Nov 02 '17 at 09:13
  • I connected to it with SSL and didn't send any SNI information, and it authenticated with a certificate issued to Google. – David Schwartz Nov 02 '17 at 09:19
  • Hi @DavidSchwartz, thanks a lot, i think you did solve my question. My application is a bunch of htmls and js which is bundled as an desktop app using `electron` and I did use google's font in my application. – vincent911001 Nov 02 '17 at 09:24

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