Looking at captures from Windows clients revealed that our idl is not able to parse DCERPC_PKT_CO_CANCEL and DCERPC_PKT_ORPHANED pdus.
This bug was referenced in samba master: c37adb762640b7df9731d6a60edce808aa8787f8 5c724a3e156ae734e4d187bf9639d895bb011834 9ec22e680249cfde06fb1a0a34fcc94d1f47002d
Created attachment 18034 [details] Patches for v4-19-test
Created attachment 18035 [details] Patches for v4-18-test
Created attachment 18036 [details] Patches for v4-17-test
Pushed to autobuild-v4-{19,18,17}-test.
This bug was referenced in samba v4-18-test: f2604db12b0a5da6ad3b28d4a0257ec1dd4a37fc 30f317cfb094db05abd3bd368806304be30f232b 1b3197ff477714239eca42722cc368c366827327
This bug was referenced in samba v4-17-test: 95bb8115a370e7d33222d1cb94959e69eae5d1d5 4233de9bd485f45dc44b19fc6fd7221c6bb9e2e0 3a0ae0c6f0195eead91cc20d27ed227c63c7441e
This bug was referenced in samba v4-19-test: a436b0d163019f43b10ce0c16bcc7210f7df9f1a b9e48047ad1e60f0e30ebb3b26921a7ca3054f71 f3acbab97f00aa4047d6730fd328400e4fb06c49
Closing out bug report. Thanks!
This bug was referenced in samba v4-18-stable (Release samba-4.18.6): f2604db12b0a5da6ad3b28d4a0257ec1dd4a37fc 30f317cfb094db05abd3bd368806304be30f232b 1b3197ff477714239eca42722cc368c366827327
This bug was referenced in samba v4-19-stable (Release samba-4.19.0rc3): a436b0d163019f43b10ce0c16bcc7210f7df9f1a b9e48047ad1e60f0e30ebb3b26921a7ca3054f71 f3acbab97f00aa4047d6730fd328400e4fb06c49
This bug was referenced in samba v4-17-stable (Release samba-4.17.11): 95bb8115a370e7d33222d1cb94959e69eae5d1d5 4233de9bd485f45dc44b19fc6fd7221c6bb9e2e0 3a0ae0c6f0195eead91cc20d27ed227c63c7441e