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Last active August 4, 2016 15:21
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Access_EC2_from_behind_the firewall_ that_block_port_22.md

Access EC2 from behind the firewall that block port 22

If your corporate firewall does not allow ssh to EC2 instances due to blocked port 22 you can follow below workaround temporarily to ssh to EC2 instances.

Essentially you need to change the sshd configuration to use port 80 which is typically open in most firewalls to allow http access.

Step 1: Launch a new EC2 instance

Step 2: On "3. Configure Instance" step, expand the "Advanced Details" section and put the below code

#!/bin/bash -ex
perl -pi -e 's/^#?Port 22$/Port 80/' /etc/ssh/sshd_config
service sshd restart || service ssh restart

Step 3: Launch the instance

Step 4: After successful startup, use the below ssh command to connect to this instance

ssh -p 80 -i "YOURKEYPAIR.pem" ec2-user@IPADDRESS

Inspired by: https://alestic.com/2010/12/ec2-ssh-port-80/

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