[Solved] ASP.Net Core Web API Error: The SSL connection could not be established

Hi mostafamohame...,

If it runs from localhost, then its firewall issue on the deployed server.

Please verify that.

Or you can bypass the certificate using the following code.

[HttpGet("GetDataByLang")]
public async Task<IActionResult> GetDataByLang(string lang)
{
    try
    {
        using (HttpClientHandler handler = new HttpClientHandler())
        {
            handler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => { return true; };
            using (HttpClient client = new HttpClient(handler))
            {
                string response = await client.GetStringAsync(_url);
                var data = JsonConvert.DeserializeObject<TadawulModeList>(response);
                return Ok(data);
            }
        }
    }
    catch (Exception ex)
    {
        _logger.LogError(ex, "An error occurred while making an HTTP request.");
        return StatusCode(StatusCodes.Status500InternalServerError, ex.Message);
    }
}