Error using GetTickets()?

[tmenegh]

Hello,
I've been using the API for quite some time now. I had an issue present itself on 7/4 around 5 A.M. The API is used within a webpage running on Windows Server 2003 with .NET Framework 4. I've verified communication with the server and zendesk via a cURL post but I'm still receive the error below.

The underlying connection was closed: An unexpected error occurred on a send.Error content:
Resource String: tickets/7774013.json +

The issue only occurs on the server. I am able to run it from my development machine without error. Any suggestions?

[mozts2005]

Without more information, I can be sure what your issue is. I have a few ideas.

1. Rate limit
2. TLS

What version of the of the library are you using?
Can you share stack trace?

[wclarke99]

Hi @mozts2005 We are having the same issue, "The underlying connection was closed: An unexpected error occurred on a send". We have been running this code for 18 months without issue. file ZendeskApi_v2_35 Version 2.0.0.0

[tmenegh]

It appears to be an issue with TLS and .Net Framework 4. The issue was present when trying to run the Models.Ticket.GetTicket() function from a console application on the server. I was unable to complete any requests to our zendesk subdomain from the server using the RestSharp library written by John Sheehan as well. We have since moved to a new 2012 Web Server and all issues have been resolved.

Thank you for your time.

[mozts2005]

@wclarke99 I would like to help you more. Can you provide a stack trace?

@tmenegh I am glad that you were able to fix the issue.

[wclarke99]

@mozts2005 Hi Elizabeth, below is the stack track -
Stack trace: at ZendeskApi_v2.Core.RunRequest(String resource, String requestMethod, Object body)
at ZendeskApi_v2.Core.RunRequest[T](String resource, String requestMethod, Object body)
at ZendeskApi_v2.Core.GenericGet[T](String resource)
at ZendeskApi_v2.Requests.Tickets.GetTicketForms()
at ZendeskAPIWrapper.GetTicketForms()
at ServiceRequests_2.GenerateAddNewRequestSelections()
at ServiceRequests_2.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

[mozts2005]

@wclarke99 Based on my testing and I think your issue is TLS cipher suites. I would use IISCrypto to test which ones are supported on your server and by zendesk.

[mozts2005]

There has not been a reply in over a week. I am closing this issue

[seagulledge]

I had this same problem with an .Net 4.52 application. The underlying network calls use TLS 1.0 as the default. The fix was to add before the API call:
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

Note: .Net 4.6 or higher uses TLS 1.2 as the default

[ghost]

I also had this problem and @seagulledge 's solution has worked perfectly! Thank you :)

[ShriN]

Thanks @seagulledge! Your solution worked perfectly.

[QuentinDosSantos]

Thank you so much @seagulledge !