Just to update, the latest update Catalina 10.15.7 has fixed the issue.

any update?

Hi eskimo, There is change of behaviour after the 10.15.6 supplement update. Now the system will crash when handleNewFlow func return true. Before the update, system will always crash when handleNewFlow return true/false. I have filed the bug #FB8443686 override func handleNewFlow(_ flow: NEAppProxyFlow) -> Bool {		if let TCPFlow = flow as? NEAppProxyTCPFlow { guard let remoteEndpoint = TCPFlow.remoteEndpoint as? NWHostEndpoint else { return false } if Int(remoteEndpoint.port) == 445 { return true // system crash after return } } }

Hi eskimo, any update? will this be resolved in next macOS update?

Filed the bug FB8186989

Hello, any update on above case?

Below is the problem report of the crash: panic(cpu 0 caller 0xffffff80072469aa): Kernel trap at 0xffffff800723f193, type 14=page fault, registers: CR0: 0x0000000080010033, CR2: 0x0000000000000008, CR3: 0x000000001b78b000, CR4: 0x00000000003626e0 RAX: 0x0000000000000001, RBX: 0x0000000000000000, RCX: 0x0000000000000021, RDX: 0xffffff812509bbf0 RSP: 0xffffff812509bb68, RBP: 0xffffff812509bb90, RSI: 0x0000000000000000, RDI: 0x0000000000000000 R8: 0x0000000000000001, R9: 0x0000000000000002, R10: 0x0000000200011000, R11: 0x0000000000080009 R12: 0x0000000000000000, R13: 0x0000000000000001, R14: 0x0000000000000000, R15: 0xffffff812509bbf0 RFL: 0x0000000000010246, RIP: 0xffffff800723f193, CS: 0x0000000000000008, SS: 0x0000000000000010 Fault CR2: 0x0000000000000008, Error code: 0x0000000000000000, Fault CPU: 0x0, PL: 0, VF: 1 Backtrace (CPU 0), Frame : Return Address 0xffffff812509b5c0 : 0xffffff800711a65d 0xffffff812509b610 : 0xffffff8007254a75 0xffffff812509b650 : 0xffffff80072465fe 0xffffff812509b6a0 : 0xffffff80070c0a40 0xffffff812509b6c0 : 0xffffff8007119d27 0xffffff812509b7c0 : 0xffffff800711a117 0xffffff812509b810 : 0xffffff80078c1abc 0xffffff812509b880 : 0xffffff80072469aa 0xffffff812509ba00 : 0xffffff80072466a8 0xffffff812509ba50 : 0xffffff80070c0a40 0xffffff812509ba70 : 0xffffff800723f193 0xffffff812509bb90 : 0xffffff8007566c76 0xffffff812509bc40 : 0xffffff8007565f7a 0xffffff812509bd20 : 0xffffff80076d1d85 0xffffff812509bd60 : 0xffffff80076fb894 0xffffff812509be30 : 0xffffff7f8b544496 0xffffff812509be90 : 0xffffff7f8b543d4e 0xffffff812509bee0 : 0xffffff7f8b53cfa9 0xffffff812509bfa0 : 0xffffff80070c013e Kernel Extensions in backtrace: com.apple.filesystems.smbfs(3.4.4)[FF9F31DA-C872-3A49-81FE-9AE0A5B2ED8E]@0xffffff7f8b50c000->0xffffff7f8b579fff dependency: com.apple.kec.corecrypto(1.0)[804DD660-F561-3444-A076-05D7A52D65E3]@0xffffff7f88146000 dependency: com.apple.kext.triggers(1.0)[882413D2-4F99-341C-AD2A-D2C11D713252]@0xffffff7f8ace2000 BSD process name corresponding to current thread: kerneltask Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev Mac OS version: 19G73 Kernel version: Darwin Kernel Version 19.6.0: Sun Jul 5 00:43:10 PDT 2020; root:xnu-6153.141.1~9/RELEASEX8664 Kernel UUID: 783946EA-6F11-3647-BF90-787AEA14B954 Kernel slide: 0x0000000006e00000 Kernel text base: 0xffffff8007000000 HIB text base: 0xffffff8006f00000 System model name: MacBookAir9,1 (Mac-0CFF9C7C2B63DF8D) System shutdown begun: NO System uptime in nanoseconds: 1495676069209 last loaded kext at 1495390957589: @filesystems.smbfs 3.4.4 (addr 0xffffff7f8b50c000, size 450560) last unloaded kext at 984552888859: >!AThunderboltDPOutAdapter 6.2.6 (addr 0xffffff7f8b21d000, size 49152) loaded kexts: @filesystems.smbfs 3.4.4 >!AGraphicsDevicePolicy 5.2.6 @AGDCPluginDisplayMetrics 5.2.6 @fileutil 20.036.15 @filesystems.ntfs 3.14.3 >!AHV 1 |IOUserEthernet 1.0.1 |IO!BSerialManager 7.0.6f7 >!AUpstreamUserClient 3.6.8 >X86PlatformShim 1.0.0 >!APlatformEnabler 2.7.0d0 >AGPM 111.4.4 >pmtelemetry 1 >!A!IICLGraphics 14.0.7 @DontStealMacOS_X 7.0.0 >!AThunderboltIP 3.1.4 >!ABacklight 180.3 >BridgeAudioCommunication 6.70.7 >!AMCCSControl 1.14 >!ABridgeAudio!C 6.70.7 >!AGFXHDA 100.1.429 >!A!IPCHPMC 2.0.1 >!ATopCaseHIDEventDriver 3430.1 >!AHIDALSService 1 >!A!IICLLPGraphicsFramebuffer 14.0.7 >!A!ISlowAdaptiveClocking 4.0.0 >!AAVEBridge 6.1 @filesystems.exfat 1.4 @filesystems.autofs 3.0 @filesystems.apfs 1412.141.1 >BCMWLANFirmware4355.Hashstore 1 >BCMWLANFirmware4364.Hashstore 1 >BCMWLANFirmware4377.Hashstore 1 >!A!BModule 1 @filesystems.hfs.kext 522.100.5 @BootCache 40 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1 @!AFSCompression.!AFSCompressionTypeZlib 1.0.0 >!AVirtIO 1.0 @private.KextAudit 1.0 >!ASmartBatteryManager 161.0.0 >!ABCMWLANBusInterfacePCIe 1 >!AACPIButtons 6.1 >!ASMBIOS 2.1 >!AACPIEC 6.1 >!AAPIC 1.7 $!AImage4 1 @nke.applicationfirewall 303 $TMSafetyNet 8 @!ASystemPolicy 2.0.0 |EndpointSecurity 1 >!AGraphicsControl 5.2.6 |IOAVB!F 850.1 >!ABacklightExpert 1.1.0 @!AGPUWrangler 5.2.6 >!ASMBus!C 1.0.18d1 >X86PlatformPlugin 1.0.0 >!AActuatorDriver 3440.1 |IONDRVSupport 576.1 >IOPlatformPlugin!F 6.0.0d8 >!AHS!BDriver 3430.1 >IO!BHIDDriver 7.0.6f7 >!AMultitouchDriver 3440.1 >!AInputDeviceSupport 3440.8 >!AHIDKeyboard 209 @!AGraphicsDeviceControl 5.2.6 |IOAccelerator!F2 438.7.3 |IOGraphics!F 576.1 |IOSlowAdaptiveClocking!F 1.0.0 @plugin.IOgPTPPlugin 840.3 |IOEthernetAVB!C 1.1.0 @kext.triggers 1.0 >usb.cdc.ncm 5.0.0 >usb.cdc 5.0.0 >usb.networking 5.0.0 >usb.!UHostCompositeDevice 1.2 >usb.!UHub 1.2 >usb.!UVHCIBCE 1.2 >usb.!UVHCI 1.2 >usb.!UVHCICommonBCE 1.0 >usb.!UVHCICommon 1.0 >!AEffaceableNOR 1.0 |IOBufferCopy!C 1.1.0 |IOBufferCopyEngine!F 1 |IONVMe!F 2.1.0 >IO!BHost!CPCIeTransport 7.0.6f7 |IO!BHost!CTransport 7.0.6f7 >!A!BDebug 1 >!AConvergedIPCOLYBTControl 1 >!A!BDebugService 1 >!AConvergedPCI 1 >!AThunderboltPCIDownAdapter 2.5.4 >!AThunderboltDPInAdapter 6.2.6 >!AThunderboltDPAdapter!F 6.2.6 >!AHPM 3.4.4 >!A!ILpssI2C!C 3.0.60 >!A!ILpssDmac 3.0.60 >!A!ILpssI2C 3.0.60 >!AThunderboltNHI 5.8.6 |IOThunderbolt!F 7.6.1 >usb.!UXHCIPCI 1.2 >usb.!UXHCI 1.2 |IOSurface 269.11 @filesystems.hfs.encodings.kext 1 |IOAudio!F 300.2 @vecLib.kext 1.2.0 >usb.!UHostPacketFilter 1.0 |IOUSB!F 900.4.2 >!AEFINVRAM 2.1 >!ABCMWLANCore 1.0.0 >mDNSOffloadUserClient 1.0.1b8 >IOImageLoader 1.0.0 |IOSerial!F 11 |IO80211!FV2 1200.12.2b1 |IOSkywalk!F 1 >!AEFIRuntime 2.1 >!AMultiFunctionManager 1 >corecapture 1.0.4 >!ASMCRTC 1.0 |IOSMBus!F 1.1 |IOHID!F 2.0.0 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1 >!AKeyStore 2 >!UTDM 489.120.1 |IOSCSIBlockCommandsDevice 422.120.3 >!ACredentialManager 1.0 >!AFDEKeyStore 28.30 >!AEffaceable!S 1.0 >!AMobileFileIntegrity 1.0.5 @kext.CoreTrust 1 |CoreAnalytics!F 1 |IOTimeSync!F 840.3 |IONetworking!F 3.4 >DiskImages 493.0.0 |IO!B!F 7.0.6f7 |IO!BPacketLogger 7.0.6f7 >!ASSE 1.0 >KernelRelayHost 1 >!ASEPManager 1.0.1 >IOSlaveProcessor 1 |IOUSBMass!SDriver 157.140.1 |IOSCSIArchitectureModel!F 422.120.3 |IO!S!F 2.1 |IOUSBHost!F 1.2 >usb.!UCommon 1.0 >!UHostMergeProperties 1.2 >!ABusPower!C 1.0 |IOReport!F 47 >!AACPIPlatform 6.1 >!ASMC 3.1.9 >watchdog 1 |IOPCI!F 2.9 |IOACPI!F 1.4 @kec.pthread 1 @kec.corecrypto 1.0 @kec.Libm 1