C#•10mo ago

ReCaptcha verify - The response ended prematurely

I an getting this error, when sending captchaData to the server for verifying. I would think the problem would be with accessing internet connection, but as far as I can see, the recaptcha verifying site can be accessed from the server. (https://www.google.com/recaptcha/api/siteverify) Any idea what else can i check?

13 Replies

canton7•10mo ago

Make sure that you're sending the full response? It's hard to be more specific with so little detail

reeeeeeeOP•10mo ago

Yeah ik, but I dont know what else could I say more... I am using var isCaptchaValid = await _recaptchaService.VerifyAsync(model.CaptchaResponse); and it throws and exception

System.Net.Http.HttpRequestException: An error occurred while sending the request.
 ---> System.IO.IOException: The response ended prematurely.

System.Net.Http.HttpRequestException: An error occurred while sending the request.
 ---> System.IO.IOException: The response ended prematurely.

It works locally and on first server, but not on the second server. (I am using correct Captcha keys for specific domain)

canton7•10mo ago

Oh, it's a HttpClient error. That wasn't clear -- it sounded like an error from recaptcha Look at the InnerException(s)

reeeeeeeOP•10mo ago

ah yes, sorry... i am only getting this:

System.Net.Http.HttpRequestException: An error occurred while sending the request.
 ---> System.IO.IOException: The response ended prematurely.
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)

System.Net.Http.HttpRequestException: An error occurred while sending the request.
 ---> System.IO.IOException: The response ended prematurely.
   at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)

in debug, the application is sending reques to this site:

System.Net.Http.HttpClient.IReCaptchaService.LogicalHandler: Information: Start processing HTTP request POST https://www.google.com/recaptcha/api/siteverify
System.Net.Http.HttpClient.IReCaptchaService.ClientHandler: Information: Sending HTTP request POST https://www.google.com/recaptcha/api/siteverify

System.Net.Http.HttpClient.IReCaptchaService.LogicalHandler: Information: Start processing HTTP request POST https://www.google.com/recaptcha/api/siteverify
System.Net.Http.HttpClient.IReCaptchaService.ClientHandler: Information: Sending HTTP request POST https://www.google.com/recaptcha/api/siteverify

which can be opened in chrome for example, so idk why would it fail when calling from the API

canton7•10mo ago

Can you debug it, break when the exception is thrown and inspect the exception?

reeeeeeeOP•10mo ago

sadly not.. i can access this server only from RDP inside RDP... I dont know how can i duplicate the issue

reeeeeeeOP•10mo ago

I have some additional info.. 🙂 I can open that link in browser, but can't curl it from cmd. I assume its something with firewall or something like that?

canton7•10mo ago

That's schannel, the windows certificate store stuff Check your event log maybe, see if it logged a more specific error

reeeeeeeOP•10mo ago

ah yes i see. This is the error:

The certificate received from the remote server was issued by an untrusted certificate authority. Because of this, none of the data contained in the certificate can be validated. The TLS connection request has failed. The attached data contains the server certificate.
 The SSPI client process is Ssms (PID: 10876).

The certificate received from the remote server was issued by an untrusted certificate authority. Because of this, none of the data contained in the certificate can be validated. The TLS connection request has failed. The attached data contains the server certificate.
 The SSPI client process is Ssms (PID: 10876).

canton7•10mo ago

(Trustworthiness there is being determined by the Windows cert store stuff of course: nothing to do with .NET)

reeeeeeeOP•10mo ago

aha okay. I assume this should be done by sysadmin, or could I do that without any particular permissions?

canton7•10mo ago

No idea I'm afraid -- I haven't seen that specific error before

reeeeeeeOP•10mo ago

okay. Thank you for your help!

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ReCaptcha verify - The response ended prematurely