How to check for and avoid port exhaustion in Windows. Steps to Reproduce. Clarifying Information. Error Message. Defect Number. Enhancement Number. Resolution When linking to an article, use a Smart Link. Click on the Network Tab, then select the listening ports. Sort the ports in ascending order to show lowest to greatest port numbers. Scroll to the largest number, if it is , then port exhaustion is occurring.
Keyword Phrase. We should almost never run out, right? By default in the Windows operating system, we only have a limited number of ports available for outbound communications. We sometimes call these user ports, because user-mode processes are what we really expect to be using these things most often. However, in order to negotiate the session, you need a client port on your computer to use for this, and so the application making the connection Windows Explorer, in the case of browsing files gets a dynamically-assigned port to use.
So, you had a little less than ports available for outbound network communication. Ports above that range were generally reserved for application listeners. And when this happens, communication starts to break down. We run into this scenario a lot more often than you might think, and it causes the types of issues I detailed above. So, over time, it uses up more and more ports from the dynamic range until we run out.
In most networks there are potentially dozens, if not hundreds, of different applications that might be communicating with other servers over the network — security tools, management and monitoring tools, line of business applications, internal server processes, and so on. So when you have a problem like this, narrowing down which application is causing the problem can be a challenge. Fortunately, there are a couple of tools that make this easier, and the best part is, they come with the operating system.
Netstat can tell you which ports are in use, where the communication is going, and what application has the port open. Give it a name of MaxUserPort The capitalization matters. Specify a value between and The higher the value, the wider the range of available ports.
Many users have had success with value decimal. Specify a value 1 either decimal or hexadecimal. Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties.
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