UK Sandbox problem - more info as requested by eBay Developer Page on facebook
Currently we're experiencing the following error: eBay.Service.Core.Sdk.ApiException: 'The underlying connection was closed: A connection that was expected to be kept alive was closed by the server.' We get this when calling apiCall.GetCategories(). The call seems to work a number of times for certain categories and then we get the above error. The same code works fine on the production site (UK). The code that's failing has been running fine for many weeks, and it also works fine on the production eBay API so it seems there is a problem with the sandbox servers. The problem exists on the UK Sandbox e.g. using a UK Sitecode. For now I have had to switch my test code to use the US site code which does not have the problem. I first posted this problem here 4 weeks ago where it got totally ignored.
https://forums.developer.ebay.com/questions/26518/problem-retrieving-categories-from-the-ebay-sandbo.html You guys seriously need to have a way to inform you when you have an API problem!