Hello, Google Cloud Server is unable to connect to SSH, and the firewall has already opened port 22, but still cannot connect and prompts that port 22 is not open!
Without knowing the exact setup of the environment. You could check out this doc on troubleshooting ssh connectivity.
https://cloud.google.com/compute/docs/troubleshooting/troubleshooting-ssh-errors
There are many thing
- Incorrect firewall rule
- no ssh key on VM
- org policy
Also did you try to ssh using SSH open in browser window?