Referring to case id 00895236.
When using a localhost proxy (127.0.0.1:1666) (for each build slave) one has to specify this as part of a Perforce password based credential.
Then even the server (CI master) contacts the specified proxy although no data is pulled: data folder is empty, log file is empty.
My current workaround is to install a local proxy on the master node to be able to use a local proxy on the slaves.
Please either remove this "alive test" or make it somehow optional/configurable.