Failed to acquire machine: [Errno 113] No route to host]'

https://testresults.qt.io/coin/integration/qt/qt5/tasks/1575477941

Coin failed to acquire a virtual machine, re-staging is unlikely to help, please contact the admins: 'AgentException: 'Failed repeatedly to launch build/test agent' reasons: [Failed to acquire machine and run agent within reasonable time (attempt: 1, agent: 1575457798-8417, address: None, template: qtci-linux-Ubuntu-18.04-x86_64-4b50d8, host: ); [Errno 113] No route to host; [Errno 113] No route to host; Failed to acquire machine and run agent within reasonable time (attempt: 4, agent: 1575457798-9683, address: None, template: qtci-linux-Ubuntu-18.04-x86_64-4b50d8, host: ); [Errno 110] Connection timed out; Failed to acquire machine and run agent within reasonable time (attempt: 6, agent: 1575457798-10536, address: None, template: qtci-linux-Ubuntu-18.04-x86_64-4b50d8, host: ); [Errno 113] No route to host]'

What does the error mean and why did it happen?

srutledg got also the same error in a different integration. Can we count how often these happen?