Rudder

When trying to start the 5.1 webapp, it stalls with:

[2019-06-12 14:42:07] INFO  application - registered property: user.home="/root" 
[2019-06-12 14:42:07] INFO  application - registered property: user.language="en" 
[2019-06-12 14:42:07] INFO  application - registered property: user.name="root" 
[2019-06-12 14:42:07] INFO  application - registered property: user.timezone="UTC" 
[2019-06-12 14:42:08] INFO  bootchecks - Check LDAP and PostgreSQL connection
[2019-06-12 14:42:08] INFO  bootchecks - LDAP and PostgreSQL connection are OK
[2019-06-12 14:42:08] INFO  bootchecks - Check mandatory DIT entries
[2019-06-12 14:42:08] INFO  bootchecks - All the required DIT entries are present in the LDAP directory
[2019-06-12 14:42:08] INFO  bootchecks - Check initialization of User Technique Library
[2019-06-12 14:42:08] INFO  bootchecks - Check event log migration format 5 -> 6
[2019-06-12 14:42:08] INFO  bootchecks - Check existence of at least one archive of the configuration
[2019-06-12 14:42:08] INFO  bootchecks - First full archive of configuration-repository items done
[2019-06-12 14:42:08] INFO  bootchecks - Check rules archive directory in configuration-repository
[2019-06-12 14:42:08] INFO  bootchecks - Creating directory '/var/rudder/configuration-repository/ruleCategories' exists, done
[2019-06-12 14:42:08] INFO  bootchecks - Check for force reload of Techniques library
[2019-06-12 14:42:08] INFO  bootchecks - Flag file '/opt/rudder/etc/force_technique_reload' does not exist, do not Technique library will not be reloaded
[2019-06-12 14:42:08] INFO  bootchecks - Check that system group / directive / rules for Rudder 4.2 are agent-specific
[2019-06-12 14:42:09] INFO  migration - No migration detected by migration script (table 'migrationeventlog' is empty or does not exist)
[2019-06-12 14:42:09] INFO  bootchecks - Regenerate all ncf techniques
[2019-06-12 14:42:19] WARN  bootchecks - Could not authenticate in ncf API, maybe it was not initialized yet, retrying in 5 seconds
[2019-06-12 14:42:24] WARN  bootchecks - Could not authenticate in ncf API, maybe it was not initialized yet, retrying in 5 seconds
[2019-06-12 14:42:29] WARN  bootchecks - Could not authenticate in ncf API, maybe it was not initialized yet, retrying in 5 seconds
[2019-06-12 14:42:34] WARN  bootchecks - Could not authenticate in ncf API, maybe it was not initialized yet, retrying in 5 seconds

It looks like it stops trying to authenticate and does nothing after the last log.