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Cisco Bug: CSCvv18233 - SSH requests to port 830 fails when ip tcp adjust-mss is configured

Last Modified

Oct 13, 2020

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.12.2

Description (partial)

Symptom:
+SSH connection refused to port 830

+RST flag sent to SSH client which refuses the connection

Conditions:
+Command "ip tcp adjust-mss 1360" is configured on a physical interface or loopback with ipv4 address configured towards which the ssh port 830 is attempted

+netconf-yang is enabled on the target

+This has been seen at least in:

C9300-48T running 16.12.2 - > Able to repro
C9300-48U-A running 16.12.2t -> Able to repro
C9300       running 17.2     -> Able to repro

+RST flag is sent from the target switch to the ssh client hence refusing the connection
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