This began happening a few days ago, and I haven't been able to figure out why. BOINC Manager never gets past "Connecting to localhost", and I eventually get an error dialog which says "The BOINC client has exited unexpectedly 3 times within the last 2 minutes. Would you like to restart it again?"

My system

BOINC Manager Version: 8.0.0 (x64)
wxWidgets Version: 3.2.4
CPU: Intel® Core™ i9-10900K CPU @ 3.70 GHz (10 cores, 20M cache)
GPU: nVidia GeForce RTX 3070 8GB GDDR6, 5888 CUDA cores
NVIDIA DCH driver version: 551.68
DirectX runtime version: 12.0
OS: Windows 11 Pro (23H2 Build 22631.3527), 64-bit

I do not have BOINC installed as a service.

I don't see anything relevant in the Windows event logs, but the BOINC Manager output I get looks like this:

02-May-2024 21:54:24 [---] Starting BOINC client version 8.0.0 for windows_x86_64
02-May-2024 21:54:24 [---] log flags: file_xfer, task, benchmark_debug
02-May-2024 21:54:24 [---] Libraries: libcurl/8.6.0-DEV Schannel zlib/1.3.1
02-May-2024 21:54:24 [---] Data directory: C:\ProgramData\BOINC
02-May-2024 21:54:24 [---] Running under account capsa
02-May-2024 21:54:24 [---] CUDA: NVIDIA GPU 0: NVIDIA GeForce RTX 3070 (driver version 551.68, CUDA version 12.4, compute capability 8.6, 8192MB, 8192MB available, 20314 GFLOPS peak)
02-May-2024 21:54:24 [---] OpenCL: NVIDIA GPU 0: NVIDIA GeForce RTX 3070 (driver version 551.68, device version OpenCL 3.0 CUDA, 8192MB, 8192MB available, 20314 GFLOPS peak)
02-May-2024 21:54:24 [---] OpenCL: Intel GPU 0: Intel(R) UHD Graphics 630 (driver version 31.0.101.2125, device version OpenCL 3.0 NEO, 26079MB, 26079MB available, 230 GFLOPS peak)
02-May-2024 21:54:50 [---] Windows processor group 0: 20 processors
02-May-2024 21:54:50 [---] Host name: Ghostwheel-8940
02-May-2024 21:54:50 [---] Processor: 20 GenuineIntel Intel(R) Core(TM) i9-10900K CPU @ 3.70GHz [Family 6 Model 165 Stepping 5]
02-May-2024 21:54:50 [---] Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movebe popcnt aes f16c rdrandsyscall nx lm avx avx2 adx tm2 pbe fsgsbase bmi1 smep bmi2
02-May-2024 21:54:50 [---] OS: Microsoft Windows 11: Professional x64 Edition, (10.00.22631.00)
02-May-2024 21:54:50 [---] Memory: 63.67 GB physical, 73.17 GB virtual
02-May-2024 21:54:50 [---] Disk: 1.84 TB total, 1.43 TB free
02-May-2024 21:54:50 [---] Local time is UTC -4 hours
02-May-2024 21:54:50 [---] WSL detected:
02-May-2024 21:54:50 [---]    [Ubuntu-23.10] (default): Linux Ubuntu (Ubuntu 23.10 [6.1.21.2-microsoft-standard-WSL2+])
02-May-2024 21:54:50 [---]    [docker-desktop-data]: <3>WSL (22) ERROR: CreateProcessParseCommon:757: getpwuid(0) failed 2
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files\Common Files\Oracle\Java\javapath
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files (x86)\Common Files\Oracle\Java\java8path
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files (x86)\Common Files\Oracle\Java\javapath
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files\Microsoft\jdk-21.0.3.9-hotspot\bin
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files\FireDaemon OpenSSL 3\bin\
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.2\bin
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.2\libnvvp
<3>WSL (22) ERROR: UtilTranslatePathList:2866: Failed to translate C:\P
02-May-2024 21:54:50 [---]    [docker-desktop]: Linux Ubuntu (Docker Desktop [6.1.21.2-microsoft-standard-WSL2+])
02-May-2024 21:54:50 [---]    [Ubuntu-24.04]: Linux Ubuntu (Ubuntu 24.04 LTS [6.1.21.2-microsoft-standard-WSL2+])
02-May-2024 21:54:50 [---] Last CPU benchmark was 35 days 08:42:15 ago
02-May-2024 21:54:50 [climateprediction.net] General prefs: from climateprediction.net (last modified 14-Mar-2021 14:50:02)
02-May-2024 21:54:50 [climateprediction.net] Host location: none
02-May-2024 21:54:50 [climateprediction.net] General prefs: using your defaults
02-May-2024 21:54:50 [---] Reading preferences override file
02-May-2024 21:54:50 [---] Preferences:
02-May-2024 21:54:50 [---] -  When computer is in use
02-May-2024 21:54:50 [---] -     'In use' means mouse/keyboard input in last 3.00 minutes
02-May-2024 21:54:50 [---] -     max CPUs used: 20
02-May-2024 21:54:50 [---] -     Use at most 80% of the CPU time
02-May-2024 21:54:50 [---] -     suspend if non-BOINC CPU load exceeds 70%
02-May-2024 21:54:50 [---] -     max memory usage: 31.84 GB
02-May-2024 21:54:50 [---] -  When computer is not in use
02-May-2024 21:54:50 [---] -     max CPUs used: 20
02-May-2024 21:54:50 [---] -     Use at most 80% of the CPU time
02-May-2024 21:54:50 [---] -     suspend if non-BOINC CPU load exceeds 70%
02-May-2024 21:54:50 [---] -     max memory usage: 57.30 GB
02-May-2024 21:54:50 [---] -  Suspend if running on batteries
02-May-2024 21:54:50 [---] -  Leave apps in memory if not running
02-May-2024 21:54:50 [---] -  Store at least 4.00 days of work
02-May-2024 21:54:50 [---] -  Store up to an additional 1.00 days of work
02-May-2024 21:54:50 [---] -  max disk usage: 100.00 GB
02-May-2024 21:54:50 [---] -  (to change preferences, visit a project web site or select Preferences in the Manager)
02-May-2024 21:54:50 [---] Setting up project and slot directories
02-May-2024 21:54:50 [---] Checking active tasks
02-May-2024 21:54:50 [climateprediction.net] URL https://climateprediction.net/; Computer ID 1516308; resource share 20
02-May-2024 21:54:50 [NFS@Home] URL https://escatter11.fullerton.edu/nfs/; Computer ID 7178017; resource share 20
02-May-2024 21:54:50 [PrimeGrid] URL http://www.primegrid.com/; Computer ID 1069277; resource share 60
02-May-2024 21:54:50 [---] Setting up GUI RPC socket
02-May-2024 21:54:50 [---] Checking presence of 58 project files
02-May-2024 21:54:50 [PrimeGrid] Found finish file for genefer22_169096528_1; exit code 195
02-May-2024 21:54:50 [PrimeGrid] Task genefer22_169096528_1: no shared memory segment


Unhandled Exception Detected...

- Unhandled Exception Record -
Reason: Access Violation (0xc0000005) at address 0x00007FFBBB66614F read attempt from address 0x0000000000000001

Engaging BOINC Windows Runtime Debugger...



********************


BOINC Windows Runtime Debugger Version 8.0.0


Dump Timestamp    : 05/02/24 21:54:50
Loaded Library    : dbghelp.dll
LoadLibraryA( symsrv.dll ): GetLastError = 126
LoadLibraryA( symsrv.dll ): GetLastError = 126
LoadLibraryA( srcsrv.dll ): GetLastError = 126
LoadLibraryA( srcsrv.dll ): GetLastError = 126
Loaded Library    : version.dll
Debugger Engine   : 4.0.5.0
Symbol Search Path: C:\ProgramData\BOINC;C:\Program Files\BOINC;srv*C:\ProgramData\BOINC\symbols*http://msdl.microsoft.com/download/symbols;srv*C:\ProgramData\BOINC\symbols*http://boinc.berkeley.edu/symstore

I see that unhandled access exception in there, and a bunch of errors relating to WSL (not sure why BOINC Manager cares about that).

Any ideas what may have gone wrong, and what I might be able to do to repair it?

---

Any ideas what may have gone wrong, and what I might be able to do to repair it?

You're running a beta version of BOINC & BOINC Manager. Trouble like this may be happening, even after it started off as stable, it may destabilize.

What you can try is to uninstall this version, go back to an earlier version (https://boinc.berkeley.edu/download.php has 7.24.1) to see if that one has the same problems. Because if that does, it's something on your system causing this. If 7.24.1 is stable (for now), it may be that there's something wrong in BOINC 8.0

In that case, report it at https://github.com/BOINC/boinc/issues

Well, how about that?

As suggested, I uninstalled v.8.0.0 of BOINC Manager and reinstalled v.7.24.1. That was able to connect to the client and now appears to be working normally.

I'll try submitting a bug report for the beta version, which worked fine for several months - until it didn't.

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I am running tiny10 (cut down version of win10) in a VM. No such problems here with 8.0.0 Be interesting to know if the problem only occurs with 11 or if it's something else.