5. Common networking problems

6. Bad names and other DNS name resolution failures Missing capabilities Bad HTTP headers are sent Incorrect use of completion handlers in UI threads App bugs Network problems Connection timeouts Connection resets Difference in network topologies

8. Tools: Visual Studio

12. Tools: CheckNetIsolation

13. CheckNetIsolation helps you determine proper network capabilities There is no need to open firewall rules for Metro style apps

15. Tools: Fiddler

16. Used for debugging HTTP traffic CheckNetIsolation can also help set the environment to use Fiddler Some times headers have valuable information, useful when identifying a problem

18. Fiddler options, connections tab Enable “Allow Remote Computers to Connect” From elevated cmd prompt CheckNetIsolation LoopbackExempt –a –n=[Package Family Name]

19. Tools: Event Tracing for Windows

20. Sometimes problems are hard to reproduce, can’t be stepped through using the debugger Might happen in elaborate situations We need a record of the history of the events

22. Tools: Netmon

23. Sometimes to understand a problem we have understand how data is sent and what is really sent, over the wire

25. Review