$ sudo ipsilon-server-install --ipa=yes --info-sssd=yes --form=yes

Installation initiated
Installing default config files
Configuring environment helpers
Searching for keytab in: /etc/httpd/conf/http.keytab... Not found!
Searching for keytab in: /etc/httpd/conf/ipa.keytab... Not found!
Invalid credentials: [CCacheError('did not receive Kerberos credentials',)]
Invalid credentials: [did not receive Kerberos credentials]
Traceback (most recent call last):
  File "/sbin/ipsilon-server-install", line 435, in <module>
    install(fplugins, opts)
  File "/sbin/ipsilon-server-install", line 183, in install
    if plugin.configure_server(args, plugin_changes) == False:
  File "/usr/lib/python2.7/site-packages/ipsilon/helpers/ipa.py", line 176, in configure_server
    self.get_keytab(opts)
  File "/usr/lib/python2.7/site-packages/ipsilon/helpers/ipa.py", line 115, in get_keytab
    raise Exception('Invalid credentials: [%s]' % e)
Exception: Invalid credentials: [did not receive Kerberos credentials]
Installation aborted.
See log file /var/log/ipsilon-install.log for details