EA Activator Communication Issue – WebRequest returns -1, GetLastError: 4029

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Hello everyone,

I'm experiencing an issue with the activator in my EA. The EA is supposed to validate a license key by contacting a verification page using the WebRequest function. Although the EA appears to connect to the page, I never receive any response. In the Experts log, I see the following error:

Hello everyone,

I am experiencing an issue with my EA activator. The EA is designed to validate a license key by contacting a verification page, but it never receives any response from the server. In the Experts log, I see an error stating:

"License check failed. Error code: -1, GetLastError: 4029"

Here’s what I have done so far:

  • I verified that my PHP script works correctly by accessing it directly in a web browser (for example, http://127.0.0.1:80/license_check.php?license=TESTKEY returns the expected JSON response, such as {"status":"OK"}).

  • I added the exact URL (including port) to the Allowed URLs in MT4’s Expert Advisors settings (both http://127.0.0.1:80 and http://localhost:80).

  • I have run MetaTrader as an administrator and temporarily disabled my firewall/antivirus software.

  • I also tested using a public URL (like http://neverssl.com/) that should not trigger SSL redirection issues, but the error persists with GetLastError: 4029.

It appears that the EA is unable to receive any data from the server. Has anyone encountered a similar issue or can suggest further troubleshooting steps?

Thank you for your help!

 
I've attached the relevant code snippet below. Any suggestions on how to resolve this would be greatly appreciated.

#property strict

void OnStart()
{
   // Define the URL
   string url = "http://www.worldtimeserver.com/";
   
   // Arrays for storing the response and response headers
   char result[4096];
   char result_headers[4096];
   string headers;
   
   // Set the timeout in milliseconds
   int timeout = 5000;
   
   // Send a GET request to the URL
   int res = WebRequest("GET", url, "", timeout, result, result_headers, headers);
   int err = GetLastError();
   Print("WebRequest result: ", res, ", GetLastError: ", err);
   
   if(res != 200)
   {
      Print("WebRequest failed. Check that the URL is added to the allowed list (Tools → Options → Expert Advisors), run MT5 as administrator, and ensure it's not blocked by the firewall/antivirus.");
   }
   else
   {
      string response = CharArrayToString(result);
      Print("WebRequest succeeded. Response: ", response);
      Print("Response headers: ", headers);
   }
}
}
 
Salamoss:

Hello everyone,

I'm experiencing an issue with the activator in my EA. The EA is supposed to validate a license key by contacting a verification page using the WebRequest function. Although the EA appears to connect to the page, I never receive any response. In the Experts log, I see the following error:

Hello everyone,

I am experiencing an issue with my EA activator. The EA is designed to validate a license key by contacting a verification page, but it never receives any response from the server. In the Experts log, I see an error stating:

"License check failed. Error code: -1, GetLastError: 4029"

Here’s what I have done so far:

  • I verified that my PHP script works correctly by accessing it directly in a web browser (for example, http://127.0.0.1:80/license_check.php?license=TESTKEY returns the expected JSON response, such as {"status":"OK"}).

  • I added the exact URL (including port) to the Allowed URLs in MT4’s Expert Advisors settings (both http://127.0.0.1:80 and http://localhost:80).

  • I have run MetaTrader as an administrator and temporarily disabled my firewall/antivirus software.

  • I also tested using a public URL (like http://neverssl.com/) that should not trigger SSL redirection issues, but the error persists with GetLastError: 4029.

It appears that the EA is unable to receive any data from the server. Has anyone encountered a similar issue or can suggest further troubleshooting steps?

Thank you for your help!

I'd suggest not to use fixed-size arrays, all receiving arrays should be dynamic and resizable:

char result[];
char result_headers[];
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