2. Ewan MacKellar & Mario Tevanian
Office 365 Network Performance Troubleshooting
Ewan MacKellar & Mario Tevanian
PRD323

3. Who broke my Outlook?

4. So what does bad really look like?
Has anything changed that would have made things go bad?
Which applications are slow and what is the behaviour?
Where are the problems located and do they cluster?
What is the network topology and available bandwidth?
Who are the users and can they reproduce the behaviour?

5. How fast is your TCP/IP?

6. Round trip latency

7. Network trace shows round trip time
10:14:22 PM 01/11/ OUTLOOK.EXE Client1
outlook.office365.com TLS TLS:TLS Rec Layer-1
HandShake: Client Hello. {TLS:215, SSLVersionSelector:214, TCP:205, IPv4:204}
10:14:22 PM 01/11/ OUTLOOK.EXE outlook.office365.com Client1 TLS TLS:TLS Rec Layer-1
HandShake: Server Hello.; TLS Rec
Layer-2 HandShake: Certificate. {TLS:215, SSLVersionSelector:214, TCP:205, IPv4:204}

8. Using PsPing.exe to show latency
C:\>psping.exe -n 10 outlook.office365.com:443
TCP connect to :443:
11 iterations (warmup 1) connecting test:
Connecting to :443 (warmup): 51.31ms
Connecting to :443: 47.12ms ……
Connecting to :443: 46.01ms
TCP connect statistics for :443:
Sent = 10, Received = 10, Lost = 0 (0% loss),
Minimum = 41.83ms, Maximum = ms, Average = 53.20ms

9. Demo

10. Window scaling affects bandwidth

11. Segment size and selective acknowledgements
- MaxSegmentSize: 1
type: Maximum Segment Size. 2(0x2)
OptionLength: 4 (0x4)
MaxSegmentSize: (0x5B4)
- SACKPermitted:
type: SACK permitted. 4(0x4)
OptionLength: 2 (0x2

12. Demo

13. What about the network devices?

14. Check internal and external routing
C:\>tracert outlook.office365.com
Tracing route to outlook-au.office365.com [ ]
over a maximum of 30 hops:
ms ms ms
ms ms ms lns20.bne4.on.ii.net [ ]
ms ms ms xe cr1.bne4.on.ii.net [ ]
ms ms ms ae6.br1.syd7.on.ii.net [ ]
ms ms ms ae0.br1.syd4.on.ii.net [ ]
ms ms ms as12076.nsw.ix.asn.au [ ]
ms ms ms ae1-0.syd03-96cbe-1b.ntwk.msn.net [ ]
ms ms ms ae0-0.syd03-96cbe-1a.ntwk.msn.net [ ]
ms ms ms
Trace complete.

15. Demo

16. Proxy authentication
10:04:21 AM OUTLOOK.EXE Client1  proxy.contoso.com CONNECT outlook.office365.com:443
10:04:22 AM OUTLOOK.EXE proxy.contoso.com  Client HTTP/1.1, Status: Proxy authentication required
10:04:22 AM OUTLOOK.EXE Client1  proxy.contoso.com CONNECT outlook.office365.com:443 , Using NTLM
10:04:22 AM OUTLOOK.EXE proxy.contoso.com  Client1 HTTP/1.1, Status: Proxy authentication required
10:04:22 AM OUTLOOK.EXE Client1  proxy.contoso.com CONNECT outlook.office365.com:443 , Using NTLM
10:04:23 AM OUTLOOK.EXE proxy.contoso.com  Client HTTP/1.1, Status: Ok, URL: outlook.office365.com:443

17. When idle devices make Outlook fail
Disconnect pop ups in Outlook
Unexpected authentication prompts
Hangs when switching between mailboxes or calendars
Performance problems
Mail stuck in outbox

18. Egress scalability
SaaS means more outgoing connections NAT’ing outbound
Maximum of 65k ports per IP, but may be lower in practice
Multiple connections per client, per service
~6000 clients per public IP address (use 4000 for caution)

19. Packet loss Investigate over 1% Filter for Property.TCPRetransmit == 1
Check for FastRetransmit and DupACKs

20. Name Resolution

21. Geo DNS gets Outlook
there faster

22. Testing Geo DNS for clients
C:\>ping outlook.office365.com
Pinging outlook-au.office365.com [ ] with 32 bytes of data:
Reply from : bytes=32 time=45ms TTL=246
Reply from : bytes=32 time=58ms TTL=246
Reply from : bytes=32 time=131ms TTL=246
Reply from : bytes=32 time=64ms TTL=246
Ping statistics for :
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 45ms, Maximum = 131ms, Average = 74ms

23. Demo

24. Application specific steps

25. Application specific tests
Office Configuration Analyzer Tool finds configuration issues
Office 365 Client Performance Analyzer tests Outlook and SharePoint
Office 365 Fast Track Network Analysis tests Lync/SfB
Outlook connection status shows round trip latency to mailbox
Internet Explorer F12 Developer Tools for SharePoint latency

26. So where is the top ten list?
It’s right here.

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