![]() ![]() To increase the maximum number of ephemeral ports, follow these steps: Start Registry Editor. A new parameter has been added in these products. For details about these earlier releases, see the Microsoft knowledge-base article 196271, "When you try to connect from TCP ports greater than 5000, you receive the error 'WSAENOBUFS (10055). The default maximum number of ephemeral TCP ports is 5000 in the products that are included in the 'Applies to' section. For details about how to change a range under Windows, see the Microsoft knowledge-base article 929851, "The default dynamic port range for TCP/IP has changed in Windows Vista and Windows Server 2008."Įarlier releases of Windows use a default range of values from 1024 through 4999. Windows Server 2008 and later use a default range of values from 49152 through 65535. This post explains how you can do this grouping in more detail. Therefore you will need to group the output of netstat/ss by each of these tuples, and check how close each group is to the connection limit. ![]() and if your system is experiencing a high degree. Bear in mind that this limit applies per unique (source IP, peer IP, peer port) tuple. You query and change the setting under HP-UX the same as is shown for Solaris in the previous section.Īs is the case with Solaris, any changes under HP-UX last only until the next time you start your system. By default, Windows ephemeral ports are within the range 1024-4999, inclusive. Ephemeral Source Port Strategy Listing Linux, 32768 - 61000, local, random FreeBSD 10.0, 10000 - 65535, global, random Microsoft Windows 2000, 1024 - 5000. Both of these ports default to values from 49152 through 65535. The new default start port is 49152, and the default end port is 65535. HP-UX uses two separate ephemeral port ranges, one for TCP and UDP. HP-UX also uses ndd to configure the IP stack, but it is found in the /usr/bin directory ( /usr/bin/ndd). Hewlett-Packard HP-UX Operating Environment ![]() These changes last until the next time you start your system. # /usr/sbin/ndd /dev/tcp tcp_smallest_anon_port tcp_largest_anon_port # /usr/sbin/ndd -set /dev/tcp tcp_largest_anon_port 61000 # /usr/sbin/ndd -set /dev/tcp tcp_smallest_anon_port 49152 ![]()
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