It turns out it was a network configuration error. In `/etc/hosts` I first had a short name for each machine, followed by the fully qualified domain name. Apparently the order matters: After turning this around the access token issue appears to be gone. Example line: 118.138.237.114 mds-hdp-01.erc.monash.edu.au mds-hdp-01.erc.monash.edu mds-hdp-01 (before that I had the short name mds-hdp-01 first). ... View more