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OCI: SSH Access Failure (“No route to host”) Due to Firewalld Misconfiguration

in Linux

Applies to:

Oracle Cloud Infrastructure (OCI)
Oracle Linux Instances

Symptoms:

When attempting to SSH into an Oracle Linux 8 instance on OCI, users encounter the following error:

ssh: connect to host x.x.x.x  port 22: No route to host

Despite this, ICMP ping responses confirm the instance is reachable at the IP level:

$ ping x.x.x.x
Pinging  x.x.x.x  with 32 bytes of data:
Reply from x.x.x.x : bytes=32 time=139ms TTL=60
Reply from x.x.x.x : bytes=32 time=141ms TTL=60
Reply from x.x.x.x : bytes=32 time=143ms TTL=60
Reply from x.x.x.x : bytes=32 time=177ms TTL=60
Tagged:

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