Local agent doesn't hang-up SSH session after network interruption

Issue Summary

When an SSH task is running on a local agent, if there's a network event which causes the SSH connection to fail, hanging the build, Bamboo fails to properly close the connection. Leaving the build in an 'unknown' state

Steps to Reproduce

1. configure plan using local agent to SSH into a remote server
2. run build
3. while build is running force network disconnect between Bamboo server, and target server.

Expected Results

Bamboo closes the SSH session

Actual Results

log entries included below

Workaround

Stop and restart the Bamboo application to reset the Local Agent status