In this case, we are interested in SYN (synchronization) and ACK (acknowledgment) flags.

TCP flags or flag bits in a TCP header are used to initiate connections, carry data, and close connections. Transport Control Protocol (TCP) is the protocol designed to track how much data has been transmitted with the guarantee of data transmission (unlike UDP). Office 365 uses the TCP/IP stack for connecting to Microsoft servers. Use the same approach to configure routing for internet access in branch offices.Ĭheck TCP window scaling configuration. If your organization has a complex structure with branches located in different countries or regions, configure local DNS servers at each branch location instead of using one central DNS server. Proper DNS configuration helps you achieve this.

Local computers should be connected to the nearest Microsoft datacenter to reduce the round-trip time and improve the user experience. Microsoft datacenters are distributed across the globe.

Make sure DNS is configured and works correctly.

It is recommended that you have local internet egress at the user’s location. The easiest way to check network latency and stability of your network connection for initial analysis is to ping Microsoft servers. Lost packets have a negative impact on Office 365 performance.

Check whether your internet connection is reliable and is not interrupted.

This time depends on the distance, transmission medium, the number of hops (routers), and destination server response time.

Take into account the round-trip time (RTT), which is the time it takes data to be sent from a sender to a destination host, plus the time needed to receive the acknowledgment back to the original sender.

If you need to use a wireless connection, make sure that the signal level is strong enough, and the channel is selected correctly and doesn’t interfere with the same channel number of nearby Wi-Fi networks. A wireless network connection can be unstable and have high latency.

Opt for a wired network over a wireless network connection.

Traffic inspection software on routers also has a negative impact on performance. Network congestion reduces Office 365 performance. If traffic shaping is configured, make sure the internet speed for clients is enough to work in Office 365. Outlook Online initiates such connections for proper work. Office 365 establishes a high number of longer-lasting network connections.

Make sure your router and firewall don’t terminate long-term TCP connections if they are idle.

Make sure IP addresses, protocols, and file types needed to work in Office 365 are not blocked.

Check the configuration on your routers and firewalls.

Fixing internet connection issues affecting Office 365 performance These Office 365 issues are inconvenient when you want to open a document or write changes to it, and can considerably slow down operations. When using Office 365 online applications in a web browser and working with files in the cloud, a slow internet connection with high latency causes lags and delays. You need an internet connection with high bandwidth and low latency. The main requirement for using Office 365 is an internet connection. The reasons can be issues on a client’s computer (hardware and software), network or internet connection issues, and issues on Microsoft’s side (software updates, issues in a datacenter).

There are multiple factors that can cause Office 365 slow performance. DISCOVER SOLUTION Why Is Office 365 Running Slow?

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