On The Wire

Office 365 and Network Connectivity hints and tips

Office 365 Connectivity Guidance: Part 4

  1. Assess bypassing proxies, traffic inspection devices and duplicate security technologies The...

Author: Paul Collinge (MSFT) Date: 06/18/2019

Office 365 Connectivity Guidance: Part 3

  1. Optimize Route Length & Avoid Network Hairpins The third principle is to Optimize Route...

Author: Paul Collinge (MSFT) Date: 06/18/2019

Office 365 URL categories to help you optimize the network traffic which really matters

Updated 21st May April 2019 As part of the improvements Microsoft announced in 2018 to the way the...

Author: Paul Collinge (MSFT) Date: 04/06/2018

URL & IP Provisioning Service for Office 365

Updated 21 May 2019 In late 2018 Microsoft made some significant updates in the connectivity space...

Author: Paul Collinge (MSFT) Date: 04/06/2018

Office 365 Connectivity Guidance: Part 2

Back to part 1 2. Localized network egress as close to the user as possible with matching DNS...

Author: Paul Collinge (MSFT) Date: 05/03/2017

Office 365 Connectivity Guidance

Updated 23 May 2019 Whilst our official guidance around Office 365 connectivity can be found at...

Author: Paul Collinge (MSFT) Date: 03/22/2017

HTTP Flood Mitigation causing slow Exchange Mailbox Migrations to Office 365

It's been a while since I've updated this blog as I've been busy rolling out content...

Author: Paul Collinge (MSFT) Date: 05/27/2015

How to analyse Application level performance for Outlook and SharePoint online

If we've stepped through all the network level checks and all looks good from that perspective,...

Author: Paul Collinge (MSFT) Date: 07/08/2014

DNS geolocation for Office 365, connecting you to your nearest Datacenter for the fastest connectivity

IMPORTANT UPDATE - This method of connectivity for Exchange Online is no longer in effect. Microsoft...

Author: Paul Collinge (MSFT) Date: 06/27/2014

Checking your TCP Packets are pulling their weight (TCP Max Segment Size or MSS)

This is a quick one to check to ensure your TCP packets are able to contain the maximum amount of...

Author: Paul Collinge (MSFT) Date: 06/27/2014

Ensuring your TCP stack isn’t throwing data away

Fw In my previous blog post, I discussed checking the MSS to ensure full sized packets are used....

Author: Paul Collinge (MSFT) Date: 06/27/2014

Ensuring your Proxy server can scale to handle Office 365 traffic

Proxy servers are often in place at customer sites, happily ticking away handling Internet traffic...

Author: Paul Collinge (MSFT) Date: 06/18/2014

Top 10 Tips for Optimising & Troubleshooting your Office 365 Network Connectivity

Having performed numerous Office 365 Network assessments and reactive visits to resolve issues for...

Author: Paul Collinge (MSFT) Date: 06/18/2014

Checking your DNS performance isn’t delaying your O365 connections

One of the initial things which should be checked is name resolution, a point which is often...

Author: Paul Collinge (MSFT) Date: 06/17/2014

Preventing proxy authentication from delaying your O365 connection

A quick and easy check you can do to ensure your O365 connections complete quickly is to check proxy...

Author: Paul Collinge (MSFT) Date: 06/16/2014

How to measure the Network Round Trip Time to Office 365

One of the jobs I do fairly often is to help customers work out the performance of their network...

Author: Paul Collinge (MSFT) Date: 05/08/2014

Ensuring your Office 365 network connection isn’t throttled by your Proxy

One of the things I'm regularly running into when looking at performance issue with Office 365...

Author: Paul Collinge (MSFT) Date: 03/28/2014

Network Perimeters & TCP Idle session settings for Outlook on Office 365

*Update . This issue no longer occurs now we've switched to MAPI/HTTPS for every client/server...

Author: Paul Collinge (MSFT) Date: 03/04/2014

TCP Offloading/Chimney & RSS…What is it and should I disable it?

Having decided to start this blog to convey my experience with network analysis and troubleshooting,...

Author: Paul Collinge (MSFT) Date: 01/21/2014