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How To Debug Slow/Hung ssh Connection (Doc ID 2546864.1)

Last updated on MARCH 08, 2023

Applies to:

Linux OS - Version Oracle Linux 5.1 to Oracle Linux 7.6 [Release OL5U1 to OL7U6]
Linux x86
Linux x86-64


Typical issues for ssh connections:


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In this Document
 Basic debug
 example commands
 Example cases
 Lots of network devices along the ssh connection
 Firewall in the middle of traffic
 DNS issues
 MTU miss-match along the connection path
 sshd_config file issues
 Hosts allow/deny files are set wrongly
 3rd party PAM modules used
 Performance issues on host or limits reached
 NIC tuning missing
 Remote logging server is not responding

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