Connection was Forcibly Closed with Catalina API

SL Quick Pay tips and tricks

If you are connecting to one of Catalina’s API endpoints (either REST or SOAP) and you are using https://, if you get an error saying the “Connection was Forcibly Closed,” this is normally because the web server requires a specific TLS version and your client isn’t using that.

If you are writing this in .NET, this can be easily overcome by adding this statement before you make a call to our API (it is normally fine to put it in the constructor or in some startup routine):

System.Net.ServicePointManager.SecurityProtocol = 
   System.Net.SecurityProtocolType.Tls12 
   | System.Net.SecurityProtocolType.Tls11 
   | System.Net.SecurityProtocolType.Tls 
   | System.Net.SecurityProtocolType.Ssl3;
RESTful API Authentication for Catalina’s API for SL
Retrieving Data in SL using Quick Query via Catalina’s SOAP Web Services

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