GetResponse giving exception always in Monodroid. I am using Dropnet Dll - xamarin.android

Question

I am working on Monodroid. I have added a Dropnet DLL (I have compiled it in Monodevelop).
I am trying to retrieve account info, below is my code
DropNetClient _client;
string dropbox_appkey = "XXX";
string dropbox_appsecret = "XXXX";
_client = new DropNetClient(dropbox_appkey, dropbox_appsecret);
_client.UserLogin = new DropNet.Models.UserLogin { Token = "XXX", Secret = "XXXX" };
var accountInfo = _client.AccountInfo();
I am getting error when the below code gets executed
return (HttpWebResponse)request.GetResponse();
error received is:
System.Net.WebException: Error getting response stream (Write: The
authentication or decryption has failed.): SendFailure --->
System.IO.IOException: The authentication or decryption has failed.
---> Mono.Security.Protocol.Tls.TlsException: Invalid certificate received from server. Error code: 0xffffffff800b010a at
Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.validateCertificates
(Mono.Security.X509.X509CertificateCollection certificates) [0x00000]
in :0 at
Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.ProcessAsTls1
() [0x00000] in :0 at
Mono.Security.Protocol.Tls.Handshake.HandshakeMessage.Process ()
[0x00000] in :0 at
Mono.Security.Protocol.Tls.ClientRecordProtocol.ProcessHandshakeMessage
(Mono.Security.Protocol.Tls.TlsStream handMsg) [0x00000] in :0 at
Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback
(IAsyncResult asyncResult) [0x00000] in :0 ---
End of inner exception stack trace --- at
Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback
(IAsyncResult asyncResult) [0x00000] in :0 ---
End of inner exception stack trace --- at
System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult)
[0x00000] in :0 at
System.Net.HttpWebRequest.GetResponse () [0x00000] in :0 at RestSharp.Http.GetRawResponse
(System.Net.HttpWebRequest request) [0x00002] in
e:\sujit\development\try5\restsharp-RestSharp-eef0c86\RestSharp\Http.Sync.cs:170
When I run URL in browser which is something like this:
https://api.dropbox.com/1/account/info?oauth_consumer_key=XXXX&oauth_nonce=3064850&oauth_signature_method=PLAINTEXT&oauth_timestamp=1347899148&oauth_token=XXXX&oauth_version=1.0&oauth_signature=XXX%26XXX
I get proper response like this:
{"referral_link": "https://www.dropbox.com/referrals/XXXX",
"display_name": "XXX XXX", "uid": XXXX, "country": "IN", "quota_info":
{"shared": XXX, "quota": XXXX, "normal": XXXX}, "email":
"XXXX#gmail.com"}
My question is why am I getting strange error using Monodroid Emulator ( I am using Monodevelop version 3.0.4.6 and I am testing on API_10 EMulator.
What should I do?
Note:
Just to add, using Authentication token of dropbox obtained by authenticating it in desktop application. I think we can reuse token of a user which uses our Desktop application for a Mobile application. Right?

Answer 1

I had a similar problem using RestSharp with Mono for Android. The cause was an invalid certificate for the development environment. I was using a static IP address (192.168.1.122) for the domain so that my phone could connect with a web service on my development machine. You can override this by adding the following line somewhere before making the web request:
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };