https://community.hpe.com/t5/operating-system-linux/max-telnet-sessions/m-p/2501655#M80102 Standart number of telnet/ssh/rlogin connections is 256. If You want to increase number change CONFIG_UNIX98_PTY_COUNT to value that You want but &lt;2048. See also CONFIG_UNIX98_PTYS parameter<BR />BTW: When not in use, each additional set of 256 PTYs occupy approximately 8 KB of kernel memory on 32-bit architectures.<BR />For additional information see: <BR />/usr/src/linux/Documentation/Configure.help Fri, 16 Mar 2001 14:16:01 GMT Romeo Ninov 2001-03-16T14:16:01Z https://community.hpe.com/t5/operating-system-linux/max-telnet-sessions/m-p/2501654#M80101 Does anybody know if and what the max telnet sessions are on a 2.2.X kernel? (Red Hat 7.0).<BR />Can one change some kernel paramaters to increase the allowable telnet sessions?<BR />I noticed a post on the HP-UX forum about this and wondered how Linux would/does handle this.<BR />Thanks,<BR /><BR />John Tue, 06 Mar 2001 17:52:37 GMT https://community.hpe.com/t5/operating-system-linux/max-telnet-sessions/m-p/2501654#M80101 John Love_3 2001-03-06T17:52:37Z https://community.hpe.com/t5/operating-system-linux/max-telnet-sessions/m-p/2501655#M80102 Standart number of telnet/ssh/rlogin connections is 256. If You want to increase number change CONFIG_UNIX98_PTY_COUNT to value that You want but &lt;2048. See also CONFIG_UNIX98_PTYS parameter<BR />BTW: When not in use, each additional set of 256 PTYs occupy approximately 8 KB of kernel memory on 32-bit architectures.<BR />For additional information see: <BR />/usr/src/linux/Documentation/Configure.help Fri, 16 Mar 2001 14:16:01 GMT https://community.hpe.com/t5/operating-system-linux/max-telnet-sessions/m-p/2501655#M80102 Romeo Ninov 2001-03-16T14:16:01Z