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 for years before Office 365 came along. As Office 365 generally travels over port 443 (for Outlook and SharePoint at least) then what’s to think about? Your proxy can handle this like any other SSL traffic right? Well, yes technically…


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 customers, its apparent that the vast majority of issues are seen time and time again. So from this experience, here are my top 10 tips for you to optimise your O365 network performance and prevent issues occurring in future. Some of…


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 customers is a network restricted by TCP Window scaling on the network egress point such as the Proxy used to connect to Office 365. This affects all connections through the device, be it to Azure, bbc.co.uk or google Bing….


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 connection aside from Outlook 2007. RPC/HTTPS which is what was causing this problem is being put out to pasture in October 2017. https://support.microsoft.com/en-au/help/3201590/rpc-over-http-deprecated-in-office-365-on-october-31,-2017 If you’re using a version of Office greater than 2007 then the advice is as follows: A minimum…


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, one subject instantly sprang to mind for my first post, TCP Chimney/Offloading. I get asked about this so often I have a ready email of advice around what it is, and what I (note not Microsoft, although I think our…