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Before you call support, this article can help you troubleshoot Office 365 performance issues and even fix some of the most common issues. This article is actually a sample action plan that you can use to capture valuable data about your performance issue as it's happening.

Some top issues are also included in this article. If you're new to network performance and want to make a long term plan to monitor performance between your client machines and Office 365, take a look at Office 365 performance tuning and troubleshooting - Admin and IT Pro.

Sample performance troubleshooting action plan This action plan contains two parts; a preparation phase, and a logging phase. If you have a performance problem right now, and you need to do data collection, you can start using this plan right away. Prepare the client computer Find a client computer that can reproduce the performance problem. This computer will be used during the course of troubleshooting.

Write down the steps that cause the performance problem to happen so you're ready when it comes time to test. Install tools for gathering and recording information: Log the performance issue Close all extraneous Internet browsers.

Start the Steps Recorder, or another screen recorder. Start your Netmon capture or network tracing tool.

Reproduce the exact steps that cause the performance issue.

  1. The list includes common network tracing tools like Netmon and Wireshark , but use any tracing tool you are comfortable with, and in which you're accustomed to filtering network traffic.
  2. Usually an IP frame has only two addresses source and destination , but in case of ICMP errors or tunneling, a single packet might contain even more addresses. Often people use a filter string to display something like ip.
  3. A Common Mistake Using the! Instead, that expression will even be true for packets where either source or destination IP address equals 1.
  4. TCP Idle Time Settings Historically, most perimeter networks are configured for transient connections, meaning idle connections are generally terminated. You can still use the old filter names for the time being, e.
  5. You should see the Developer Tool pop-up at the bottom of your browser.

Stop your Netmon or other tool's trace. Be sure to include the date and time of the capture and whether it demonstrates good or bad performance. Save the trace files. Again, be sure to include the date and time of the capture and whether it demonstrates good or bad performance. If you're not familiar with running the tools mentioned in this article, don't worry because we provide those steps next. If you're accustomed to doing this kind of network capturing, you can skip to How to collect baselineswhich describes filtering and reading the logs.

Performance troubleshooting plan for Office 365

By flushing out the DNS cache you're starting your tests with a clean slate. By clearing the cache, you're resetting the DNS resolver contents to the most up-to-date entries. Remember that a flush does not remove HOSTs file entries.

By using Netmon to trace traffic with Office 365 you can capture, view, and read packet headers, identify intervening devices, check important settings on network hardware, look for dropped packets, and follow the flow of traffic between computers on your corporate network and Office 365. Instead, you get an unfiltered trace of the path that the packet takes which can help you track down the problem behavior. Be sure you don't apply a filter at this time.

  • Try this site or sites like it;
  • Some top issues are also included in this article;
  • There is a number indicated there for the ID of this specific conversation that you can also record and look at in isolation later;
  • For example, when you have a chance, load an Office 365 service and trace the process;
  • Note that the len function yields the string length in bytes rather than multi-byte characters;
  • As an IP datagram contains both a source and a destination address, the expression will evaluate to true whenever at least one of the two addresses differs from 1.

Instead, run through the steps and demonstrate the problem before stopping the trace and saving. After you install Netmon 3. Take a Netmon trace and reproduce the issue Launch Netmon 3. There are three panes on the Start page: The Select Networks panel will also give you a list of the default networks from which you can capture.

  • Wireshark What you're looking for;
  • Remember that toolbars can be customized and options can be added to them;
  • If the performance issue is a page render, wait for the page to render before you stop the recording;
  • Reproduce the exact steps that cause the performance issue;
  • Getting good at performance takes experience, and knowledge of how your network works and usually performs.

Be sure that network cards are selected here. Click New Capture at the top of the Start page. This adds a new tab beside the Start page tab called Capture 1. To take a simple capture, click Start on the toolbar. Reproduce the steps that present a performance issue. Remember to give the date and time with the time zone and to mention if it demonstrates bad or good performance. The free Basic Edition covers everything you need for this test.

HTTPWatch monitors network traffic and page load time right from your browser window. You should see the Developer Tool pop-up at the bottom of your browser.

  • You can see this in many types of packets;
  • A lot of the settings in this conversation impact your performance;
  • You may see hangs in the product, prompts, or slow performance on page load.

The information will be slightly different, but load times will still be displayed in milliseconds. To launch the Commands bar, right-click the menu bar in Internet Explorer and click Commands bar. In the past, HTTPWatch has been associated with both the Commands and the Explorer bars, so once you install, if you don't immediately see the icon even after reboot check Tools, and your toolbars for the icon.

Remember that toolbars can be customized and options can be added to them. It will appear docked to the browser at the bottom of that window. Reproduce the exact steps involved in the performance issue. Remember to name the file so that it includes date and time information and an indication of whether your Watch contains a demonstration of good or bad performance.

You can open traces taken in the Basic Version on a computer with a Professional version and read it there. Extra information may be available from the trace through that method. It's a very useful tool and very simple to run. When the small PSR. You can add comments as needed, by clicking Add Comments. Click Stop Record when you have completed the steps.

If the performance issue is a page render, wait for the page to render before you stop the recording. The date and time is recorded for you. The date and time in the PSR record can show that a minute passed between the login and browsing of the URL and the partial render of the admin site, for example.

Read your traces It isn't possible to teach everything about network and performance troubleshooting that someone would need to know via an article. Getting good at performance takes experience, and knowledge of how your network works and usually performs.

But it is possible to round up a list of top issues and show how tools can make it easier for you to eliminate the most common problems. If you want to pick up skills reading network traces for your Office 365 sites, there is no better teacher than creating traces of page loads regularly and gaining experience reading them. For example, when you have a chance, load an Office 365 service and trace the process.

Scan the trace to get an idea of the steps that occur when the service loads. This will help you learn what normal page load should look like, and in the case of troubleshooting, particularly around performance, comparing good to bad traces can teach you a lot. Netmon uses Microsoft Intellisense in the Display filter field. Intellisense, or intelligent code completion, is that trick where you type in a period and all available options are displayed in a drop-down selection box.

If, for example, you are worried about TCP window scaling, you can find your way to a filter such as. Netmon traces can have a lot of traffic in them. If you aren't experienced with reading them, it's likely you will be overwhelmed opening the trace the first time.

The first thing to do is separate the signal from the background noise in the trace. You tested against Office 365, and that's the traffic you want to see. If you are used to navigating through tco 10 match the terms in column i with the descriptions in column ii, you may not need this list. Traffic between your client and Office 365 travels via TLS, which means that the body of the traffic will be encrypted and not readable in a generic Netmon trace.

Your performance analysis doesn't need to know the specifics of the information in the packet. It is, however, very interested in packet headers and the information that they contain. Knowing this address will let you tell at a glance whether the traffic in the trace directly involves your client computer.

If there is a known proxy, ping it and get its IP address as well. Flush your DNS resolver cache and, if possible, close all browsers except the one in which you are running your tests.

Expert Answer

If you are not able to do this, for instance, if support is using some browser-based tool to see your client computer's desktop, be prepared to filter your trace. In a busy trace, locate the Office 365 service that you're using. If you've never or seldom seen your traffic before, this is a helpful step in separating the performance issue from other network noise. There are a few ways to do this.

Masterclass – Tcpdump – Interpreting Output

Directly before your test, you can use ping or, PsPing, to the URL of the specific service ping outlook. You can also easily find that PsPing in a Netmon trace by its process name. That will give you a place to start looking. If you're only using Netmon tracing at the time of the problem, that's okay too. You can record your frame number from the trace file. You may also want to scroll the Frame Summary pane all the way to the right and look for the Conversation ID column.

There is a number indicated there for the ID of this specific conversation that you can also record and look at in isolation later. Remember to remove this filter before applying any other filtering.

Tip Netmon has a lot of helpful built-in filters. Try the "Load Filter" button at the top of the Display filter pane.

Get familiar with your traffic, and learn to locate the information you need. For example, learn to determine which packet in the trace has the first reference to the Office 365 service you're using like "Outlook".

Taking Office 365 Outlook Online as an example, the traffic begins something like this: It's important to note the Time Offset for this turn-around, as well as where in the world the Office 365 Global DNS sends the request for name resolution.

Ideally, as locally as possible, rather than half-way across the world. This may be followed by some DNS traffic the online login. This is Remote Winsock making a connection for you. A lot of the settings in this conversation impact your performance.