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XCCDF
Guide to the Secure Configuration of SUSE Linux Enterprise 15
Services
SSH Server
Configure OpenSSH Server if Necessary
Set SSH Client Alive Count Max
Set SSH Client Alive Count Max
An XCCDF Rule
Details
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Set SSH Client Alive Count Max
Medium Severity
The SSH server sends at most
ClientAliveCountMax
messages during a SSH session and waits for a response from the SSH client. The option
ClientAliveInterval
configures timeout after each
ClientAliveCountMax
message. If the SSH server does not receive a response from the client, then the connection is considered unresponsive and terminated. For SSH earlier than v8.2, a
ClientAliveCountMax
value of
0
causes a timeout precisely when the
ClientAliveInterval
is set. Starting with v8.2, a value of
0
disables the timeout functionality completely. If the option is set to a number greater than
0
, then the session will be disconnected after
ClientAliveInterval * ClientAliveCountMax
seconds without receiving a keep alive message.