Ok, so we have upgraded our lab environments to UIM 8.2 now, and lets say we have run into a problem that prevents upgrade in production.
It seems robot v7.70 has broken proxy_mode. We use proxy_mode extensively, and it seems when you enable proxy_mode on 7.70, controller ALWAYS binds to 48001, preventing spooler from starting (and all other probes).
Prior to 7.70 upgrade, you can see controller usually bind to some random port:
Sep 10 13:04:58:257 [139928451843840] Controller: Controller on andersns01.lab.basefarm.net port 47696 started in proxy mode with proxy port 48000
Sep 23 03:02:16:027 [139786458269440] Controller: Controller on andersns01.lab.basefarm.net port 45626 started in proxy mode with proxy port 48000
Oct 21 03:08:50:532 [139715260004096] Controller: Controller on andersns01.lab.basefarm.net port 44213 started in proxy mode with proxy port 48000
Nov 18 02:57:35:911 [139724099507968] Controller: Controller on andersns01.lab.basefarm.net port 45091 started in proxy mode with proxy port 48000
Nov 28 14:42:36:986 [140610258122496] Controller: Controller on andersns01.lab.basefarm.net port 47848 started in proxy mode with proxy port 48000
Dec 16 03:40:53:036 [140653161580288] Controller: Controller on andersns01.lab.basefarm.net port 50030 started in proxy mode with proxy port 48000
Jan 13 13:59:18:201 [140202665068288] Controller: Controller on andersns01.lab.basefarm.net port 43331 started in proxy mode with proxy port 48000
Jan 20 03:41:52:749 [140671462336256] Controller: Controller on andersns01.lab.basefarm.net port 44837 started in proxy mode with proxy port 48000
Jan 26 10:02:38:929 [139809947395840] Controller: Controller on andersns01.lab.basefarm.net port 42878 started in proxy mode with proxy port 48000
Feb 17 02:58:41:927 [140093754021632] Controller: Controller on andersns01.lab.basefarm.net port 40876 started in proxy mode with proxy port 48000
Mar 17 03:20:10:762 [140309765166848] Controller: Controller on andersns01.lab.basefarm.net port 60859 started in proxy mode with proxy port 48000
Apr 8 11:34:01:284 [139940558989056] Controller: Controller on andersns01.lab.basefarm.net port 48001 started in proxy mode with proxy port 48000
Apr 8 14:30:06:190 [140158051501824] Controller: Controller on andersns01.lab.basefarm.net port 48000 started
Apr 8 14:32:48:665 [140546641532672] Controller: Controller on andersns01.lab.basefarm.net port 48001 started in proxy mode with proxy port 48000
Then, after we upgraded to 7.70 at 11:34am today, you see it bound to 48001. Then we tested by setting proxy_mode to 0, and first_probe_port to 48000. Then you can see it binds as expected to 48000, and it works.
We then enabled proxy_mode again, and removed first_probe_port (used to cause problems with proxy_mode), and it binds to 48001, and spooler refuses to start.
So, robot v7.70 seems to break proxy_mode on your robots, so if you use it, be careful.