Some of my machines cannot be reached as client with crowdrender (..connection failed..). On these machines I see the following error in the console after starting blender. Read prefs: C:\Users\andre\AppData\Roaming\Blender Foundation\Blender\2.82\config\userpref.blend found bundled python: C:\Program Files\Blender Foundation\Blender 2.82\2.82\python register_class(...): Warning: 'CloudIssuesList' doesn't contain '_UL_' with prefix & suffix register_class(...): Warning: 'NodeReportList' doesn't contain '_UL_' with prefix & suffix 2020-02-27 19:03:20,931 ; INFO ; ###################### LOGGING START ####################### 2020-02-27 19:03:20,931 ; INFO ; Blender Version ; (2, 82, 7) 2020-02-27 19:03:20,931 ; INFO ; Bl Build type ; b'Release' 2020-02-27 19:03:20,932 ; INFO ; Bl Build Branch ; b'master' 2020-02-27 19:03:20,932 ; INFO ; Bl Platform ; b'Windows' 2020-02-27 19:03:20,932 ; INFO ; Bl bundled python ver ; 3.7.4 (default, Nov 1 2019, 13:23:36) [MSC v.1916 64 bit (AMD64)] 2020-02-27 19:03:20,932 ; INFO ; cr build type ; release 2020-02-27 19:03:20,932 ; INFO ; cr build branch ; trunk/Blender_addon/2.80/User/Crowdrender r1404 2020-02-27 19:03:20,932 ; INFO ; cr system mode is ; 20 2020-02-27 19:03:20,932 ; INFO ; System architecture ; AMD64 2020-02-27 19:03:20,933 ; INFO ; Computer name ; thor 2020-02-27 19:03:20,933 ; INFO ; Platform details ; Windows-10-10.0.18362-SP0 2020-02-27 19:03:20,933 ; INFO ; OS version ; ('10', '10.0.18362', 'SP0', '') Crowd Render user_session add-on enabled 2020-02-27 19:03:20,947 ; INFO ; New session, creating directory and files 2020-02-27 19:03:20,954 ; INFO ; CRClient Network interfaces initialised starting crowdrender... hash_tree created top hash changed, new value: 1350811699315527489783871182089 STARTED CROWDRENDER Blender 2.82 (sub 7) (hash 77d23b0bd76f built 2020-02-13 01:56:46) Blender 2.82 (sub 7) (hash 77d23b0bd76f built 2020-02-13 01:56:46) Read prefs: C:\Users\andre\AppData\Roaming\Blender Foundation\Blender\2.82\config\userpref.blend Read prefs: C:\Users\andre\AppData\Roaming\Blender Foundation\Blender\2.82\config\userpref.blend found bundled python: C:\Program Files\Blender Foundation\Blender 2.82\2.82\python found bundled python: C:\Program Files\Blender Foundation\Blender 2.82\2.82\python Crowd Render Client Interface Process ready Crowd Render Server Interface Process ready Traceback (most recent call last): File "<string>", line 1, in <module> File "C:\Users\andre\AppData\Roaming\Blender Foundation\Blender\2.82\scripts\addons\crowdrender\src\py_3_7\serv_int_start.py", line 68, in <module> machine_manager = server_interface.CRMachineManager() File "/Users/jamescrowther/Desktop/Crowdrender/cr_compile/releases/multi OS releases/blender_addon/2.80/crowdrender/src/cr/server_interface.py", line 141, in __init__ File "/Users/jamescrowther/Desktop/Crowdrender/cr_compile/releases/multi OS releases/blender_addon/2.80/crowdrender/src/cr/server_interface.py", line 401, in service_interface_process File "/Users/jamescrowther/Desktop/Crowdrender/cr_compile/releases/multi OS releases/blender_addon/2.80/crowdrender/src/cr/server_interface.py", line 573, in process_msgs File "C:\Program Files\Blender Foundation\Blender 2.82\2.82\python\lib\json\__init__.py", line 361, in loads return cls(**kw).decode(s) File "C:\Program Files\Blender Foundation\Blender 2.82\2.82\python\lib\json\decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "C:\Program Files\Blender Foundation\Blender 2.82\2.82\python\lib\json\decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) 2020-02-27 19:03:24,731 ; INFO ; CIP is ALIVE Blender quit Info: Total files 0 | Changed 0 | Failed 0 What's going wrong here and how can it be fixed?