Thanks for this - this sounds like the most likely issue. The problem is that Citrix seems to move things around somewhat as that config file does not exist. There is a xensource directory that contains the following but other than that i am a bit stuck. # ll /etc/xensource total 72 -rw-r--r-- 1 root root 1956 Dec 31 11:22 boot_time_cpus -rw------- 1 root root 11 Dec 31 11:22 boot_time_memory -rwxr-xr-x 1 root root 71 Sep 4 13:46 db.conf -rwxr-xr-x 1 root root 74 Sep 4 13:46 db.conf.rio -rw-r--r-- 1 root root 655 Sep 4 13:46 db-default-fields -rw-r--r-- 1 root root 8660 Sep 4 13:46 db_schema.sql -rw------- 1 root root 653 Dec 31 11:18 license -rwxr-xr-x 1 root root 776 Sep 4 13:46 log.conf drwxr-xr-x 2 root root 4096 Aug 29 20:11 master.d -rwxr-xr-x 1 root root 6 Sep 4 13:46 pool.conf -rw------- 1 root root 110 Dec 30 17:52 ptoken drwxr-xr-x 2 root root 4096 Sep 4 13:46 scripts -rwxr-xr-x 1 root root 199 Sep 4 13:46 xapi.conf -rwxr-xr-x 1 root root 172 Sep 4 13:46 xapi-ssl.conf -r-------- 1 root root 1286 Dec 30 17:52 xapi-ssl.pem -rwxr-xr-x 1 root root 9 Sep 4 13:46 xsdata_allowed_prefix thanks