December 6, 2023

We are delighted to announce the launch of the Microsoft 365 Connectivity Test Tool specifically designed for our customers using Microsoft 365 operated by 21Vianet. This tool, which has been successfully used in the global market for several years, has now been tailored to meet the specific needs of the China market, aiding in the diagnostics and enhancement of your Microsoft 365 service connectivity.


The tool is user-friendly and accessible without the necessity of logging in. To use the tool, simply visit and select the “Run Test” button. It will initiate a web test, following which you will be prompted to download a client application to complete the device test. On finalization of both tests, a comprehensive report will be generated detailing your connectivity performance along with actionable recommendations for optimization. The report can be conveniently saved as a PDF or printed for dissemination amongst your peers, service providers, or directly to our team for further assistance.


As of now, the tool provides support in both Simplified Chinese and English, dependent on the language preferences set in your web browser. We are working to incorporate support for Traditional Chinese and Japanese in the imminent future.


This tool is presently in a preview phase, and we wholeheartedly welcome your feedback and suggestions. We encourage you to share your inquiries and feedback at the official community ( or by contacting our customer support service directly for more personalized assistance.


Test guidance


    1. Automatically detect location. This is the default option; we will detect your location by web browser.  You will be asked to grant the “location” permission to the tool.

    2. Add your location. If you don’t grant the permission to the tool, or you find the location which detected automatically is not accurate, you can add your location manually and then run the test.

    3. Save your report. Once you get the details report, you might want to share it to your peers, service providers or our customer support team. You can save the report by print it as a PDF file by the web browser’s built-in function.


Frequently Asked Questions [see this link]


What is required to run the advanced test client?

The advanced test client requires .NET 6.0 Runtime. If you run the advanced test client without that, you’ll be directed to the .NET 6.0 installer page. Be sure to install from the Run desktop apps column for Windows. Administrator permissions on the machine are required to install .NET 6.0 Runtime.


What is Microsoft 365 service front door?

The Microsoft 365 service front door is an entry point on Microsoft’s global network where Office clients and services terminate their network connection. For an optimal network connection to Microsoft 365, It’s recommended that your network connection is terminated into the closest Microsoft 365 front door in your city or metro.


What is the best Microsoft 365 service front door?

A best Microsoft 365 service front door (formerly known as an optimal service front door) is one that is closest to your network egress, generally in your city or metro area. Use the Microsoft 365 network performance tool to determine location of your in-use Microsoft 365 service front door and the best service front door(s). If the tool determines your in-use front door is one of the best ones, then you should expect great connectivity into Microsoft’s global network.


What is an internet egress location?

The internet egress Location is the location where your network traffic exits your enterprise network and connects to the Internet. This is also identified as the location where you have a Network Address Translation (NAT) device and usually where you connect with an Internet Service Provider (ISP). If you see a long distance between your location and your internet egress location, then this may identify a significant WAN backhaul.


–The Microsoft 365 Networking team

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