Change of the port of the staging endpoint will cause Internal Error, when the port isn't open.
Here is a log:
[7bba4430-c208-43c3-8bbb-020b9a215ebb] [3scale-admin.3scale1.cloudapps.api-qe.eng.rdu2.redhat.com] [10.129.0.1] Completed 500 Internal Server Error in 102ms (ActiveRecord: 62.9ms) [7bba4430-c208-43c3-8bbb-020b9a215ebb] [3scale-admin.3scale1.cloudapps.api-qe.eng.rdu2.redhat.com] [10.129.0.1] ** [Bugsnag] No API key configured, couldn't notify [7bba4430-c208-43c3-8bbb-020b9a215ebb] [3scale-admin.3scale1.cloudapps.api-qe.eng.rdu2.redhat.com] [10.129.0.1] Errno::EHOSTUNREACH (No route to host - No route to host - connect(2) for "api-3scale-apicast-staging.3scale1.cloudapps.api-qe.eng.rdu2.redhat.com" port 4431 (api-3scale-apicast-staging.3scale1.cloudapps.api-qe.eng.rdu2.redhat.com:4431)): app/services/proxy_test_service.rb:81:in `test_request' app/services/proxy_test_service.rb:63:in `perform' app/models/proxy.rb:295:in `send_api_test_request!' app/controllers/api/integrations_controller.rb:29:in `update' lib/three_scale/middleware/multitenant.rb:116:in `_call' lib/three_scale/middleware/multitenant.rb:111:in `call' lib/action_dispatch/rails5_ssl.rb:86:in `call' 10.40.2.223 - - [07/Aug/2017:12:47:09 +0000] "PATCH /500 HTTP/1.1" 500 - 0.1092