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Increasingly unable to connect between compute instances

edited Feb 5, 2025 8:31AM in OCI - General

I manage several compute instances (all Ubuntu servers) located in different regions.

All VMs have iptables set to allow ingress traffic on port 22, and the same ingress rules are applied to the VCN's security list.

I used to be able to establish connections between hosts (ssh, rsync, scp) but it is getting increasingly difficult as more and more connections between individual hosts fail after timing out:

ssh -vvv myhost
  debug1: Connecting to myhost [xx.xx.xx.xx] port 22
debug3: set_sock_tos: set socket 3 IP_TOS 0x10

I say increasingly because a connection from HostA (Amsterdam) to HostB (Frankfurt) that was working yesterday no longer works today. The behavior appears to be expanding to more and more hosts (or maybe host pairs?), and I cannot establish a pattern.

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