Executing ad-hoc command fails on two machines

Hello,

I am currently installing ansible for managing ~200 equal DNS/DHCP appliances running linux. As a first step, I added them to the ansible host file and created a first playbook, which does nothing than executing “ls -al”. This works on 198 of the hosts, but two of them are making trouble.

When executing an ad-hoc command like “ansible problemhost1.example.com -a “ls -al” -u root -vvvv”, the following error is shown: