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(Classic ASP) Check Internet ConnectivityDemonstrates an efficient way to test for Internet connectivity.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% success = 0 set socket = Server.CreateObject("Chilkat.Socket") ' 1. Use a reliable Anycast IP. ' 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare) are the industry standards. targetIp = "8.8.8.8" ' 2. Use Port 53 (DNS). ' DNS servers typically listen on TCP Port 53 as well as UDP. ' (Alternatively, use port 443 if you suspect port 53 is blocked). port = 53 ' 3. Disable SSL (0). ' We are not doing a handshake, just a TCP connection. ssl = 0 ' 4. Short Timeout (1500ms). ' If you can't reach Google in 1.5 seconds, the connection is ' likely too poor for practical use anyway. timeoutMs = 1500 ' Connect success = socket.Connect(targetIp,port,ssl,timeoutMs) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( socket.LastErrorText) & "</pre>" Response.End End If success = socket.Close(10) Response.Write "<pre>" & Server.HTMLEncode( "We have Internet connectivity.") & "</pre>" %> </body> </html> |
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