we have some application that since our upgrade from 207 to 214 would not run

If I push an app (java web/ Spring) on cf without any services, CF loop on the push and sometime at the end (10 or 15minutes) the app running or not.

I have this trace in the events :

2015-08-26T13:19:28.00+0200 app.crash pocretform index: 0, reason: CRASHED, exit_description: failed to accept connections within health check timeout, exit_status: -1
2015-08-26T13:18:10.00+0200 app.crash pocretform index: 0, reason: CRASHED, exit_description: failed to accept connections within health check timeout, exit_status: -1
2015-08-26T13:16:48.00+0200 app.crash pocretform index: 0, reason: CRASHED, exit_description: failed to accept connections within health check timeout, exit_status: -1

and in the stdout :

2015-08-26T13:16:48.00+0200 [DEA/8] ERR Instance (index 0) failed to start accepting connections

If I bind a fake service (like mongo), the app is pushed without any problem

and in the log (stdout) I have :

2015-08-26T13:29:50.87+0200 [App/0] OUT [CONTAINER] org.apache.catalina.startup.HostConfig INFO Deployment of web application directory /home/vcap/app/.java-buildpack/tomcat/webapps/ROOT has finished in 6,502 ms
2015-08-26T13:29:50.87+0200 [App/0] OUT [CONTAINER] org.apache.coyote.http11.Http11NioProtocol INFO Starting ProtocolHandler ["http-nio-61230"]
2015-08-26T13:29:50.88+0200 [App/0] OUT [CONTAINER] org.apache.tomcat.util.net.NioSelectorPool INFO Using a shared selector for servlet write/read
2015-08-26T13:29:50.88+0200 [App/0] OUT [CONTAINER] org.apache.catalina.startup.Catalina INFO Server startup in 6540 ms

This trace does not appear, if I unbind the service.

I have also tried to push the Tomcat demo app (https://tomcat.apache.org/tomcat-6.0-doc/appdev/sample/), same behaviour. So it's not our app problem

any suggestions?