Calculating maximum supported devices behind a single public IP address with Office 365 There may be other applications, such as Internet Explorer, that could connect at the same time, requiring additional ports. Availability of ports is also affected by other factors such as Windows restricting 4,000 ports for its own use, which reduces the total number of available ports to 60,000. In this scenario, the maximum number of ports could be less than 64,000.
#POWERDIRECTOR 365 CONCURRENT USER SESSIONS NOT SUPPORTED SOFTWARE#
Note that if customers are using non-Windows OS-based devices for NAT, the total available ports are dependent on what NAT device or software is being used. Because there are a maximum of 64,000 ports available on a Windows-based NAT device, there can be a maximum of 8,000 users behind an IP address before the ports are exhausted. Outlook may open eight or more connections (in situations where there are add-ins, shared calendars, mailboxes, etc.). Why do you need to have so many connections open to Office 365 at the same time?
Each outbound connection from an internal device translates to a different source TCP port on the public IP address. These gateways make traffic from internal devices to the Internet (including Office 365) appear to be coming from one or more publicly routable IP addresses. To provide Internet access to devices on a private IP address space, organizations use gateway technologies like firewalls and proxies that provide network address translation (NAT) or port address translation (PAT) services. Private address space is allocated by the Internet Assigned Numbers Authority (IANA) and intended solely for networks that do not route directly to and from the global Internet. Most corporate networks use private (RFC1918) IP address space. Why use NAT?īy using NAT, thousands of people on a corporate network can "share" a few publicly routable IP addresses. Previously, guidance suggested that the maximum number of Exchange clients you should use per IP address to connect to Office 365 was about 2,000 clients per network port. This article applies to both Microsoft 365 Enterprise and Office 365 Enterprise.
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