This is happening to me as of this morning as well. I'd been happily folding along for weeks now. When I woke up this morning, I had the "No WUs available for this configuration" reported in the "No more WUs for my GPU available?" thread. After exiting and restarting the client, I now get HTTP_SERVICE_UNAVAILABLE.
*********************** Log Started 2020-03-14T15:32:47Z ***********************
15:32:47:************************* Folding@home Client *************************
15:32:47: Website: https://foldingathome.org/
15:32:47: Copyright: (c) 2009-2018 foldingathome.org
15:32:47: Author: Joseph Coffland <joseph@cauldrondevelopment.com>
15:32:47: Args: --open-web-control
15:32:47: Config: C:\Users\Jason\AppData\Roaming\FAHClient\config.xml
15:32:47:******************************** Build ********************************
15:32:47: Version: 7.5.1
15:32:47: Date: May 11 2018
15:32:47: Time: 13:06:32
15:32:47: Repository: Git
15:32:47: Revision: 4705bf53c635f88b8fe85af7675557e15d491ff0
15:32:47: Branch: master
15:32:47: Compiler: Visual C++ 2008
15:32:47: Options: /TP /nologo /EHa /wd4297 /wd4103 /Ox /MT
15:32:47: Platform: win32 10
15:32:47: Bits: 32
15:32:47: Mode: Release
15:32:47:******************************* System ********************************
15:32:47: CPU: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
15:32:47: CPU ID: GenuineIntel Family 6 Model 60 Stepping 3
15:32:47: CPUs: 8
15:32:47: Memory: 31.94GiB
15:32:47: Free Memory: 19.01GiB
15:32:47: Threads: WINDOWS_THREADS
15:32:47: OS Version: 6.2
15:32:47: Has Battery: false
15:32:47: On Battery: false
15:32:47: UTC Offset: -7
15:32:47: PID: 36140
15:32:47: CWD: C:\Users\Jason\AppData\Roaming\FAHClient
15:32:47: OS: Windows 10 Enterprise
15:32:47: OS Arch: AMD64
15:32:47: GPUs: 1
15:32:47: GPU 0: Bus:1 Slot:0 Func:0 NVIDIA:8 TU102 [GeForce RTX 2080 Ti Rev. A]
15:32:47: M 13448
15:32:47: CUDA Device 0: Platform:0 Device:0 Bus:1 Slot:0 Compute:7.5 Driver:10.2
15:32:47:OpenCL Device 0: Platform:0 Device:0 Bus:1 Slot:0 Compute:1.2 Driver:441.20
15:32:47: Win32 Service: false
15:32:47:***********************************************************************
15:32:47:<config>
15:32:47: <!-- Network -->
15:32:47: <proxy v=':8080'/>
15:32:47:
15:32:47: <!-- Slot Control -->
15:32:47: <power v='full'/>
15:32:47:
15:32:47: <!-- User Information -->
15:32:47: <passkey v='********************************'/>
15:32:47: <user v='JasonGore'/>
15:32:47:
15:32:47: <!-- Folding Slots -->
15:32:47: <slot id='1' type='GPU'/>
15:32:47:</config>
15:32:47:Trying to access database...
15:32:47:Successfully acquired database lock
15:32:47:Enabled folding slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448
15:32:47:WU00:FS01:Connecting to 65.254.110.245:8080
15:32:48:WARNING:WU00:FS01:Failed to get assignment from '65.254.110.245:8080': No WUs available for this configuration
15:32:48:WU00:FS01:Connecting to 18.218.241.186:80
15:32:48:WARNING:WU00:FS01:Failed to get assignment from '18.218.241.186:80': No WUs available for this configuration
15:32:48:ERROR:WU00:FS01:Exception: Could not get an assignment
15:32:48:WU00:FS01:Connecting to 65.254.110.245:8080
15:32:49:WARNING:WU00:FS01:Failed to get assignment from '65.254.110.245:8080': No WUs available for this configuration
15:32:49:WU00:FS01:Connecting to 18.218.241.186:80
15:32:49:WARNING:WU00:FS01:Failed to get assignment from '18.218.241.186:80': No WUs available for this configuration
15:32:49:ERROR:WU00:FS01:Exception: Could not get an assignment
15:32:50:10:127.0.0.1:New Web connection
15:33:49:WU00:FS01:Connecting to 65.254.110.245:8080
15:33:49:WARNING:WU00:FS01:Failed to get assignment from '65.254.110.245:8080': No WUs available for this configuration
15:33:49:WU00:FS01:Connecting to 18.218.241.186:80
15:33:49:WARNING:WU00:FS01:Failed to get assignment from '18.218.241.186:80': No WUs available for this configuration
15:33:49:ERROR:WU00:FS01:Exception: Could not get an assignment
15:35:26:WU00:FS01:Connecting to 65.254.110.245:8080
15:35:26:WU00:FS01:Assigned to work server 155.247.166.220
15:35:26:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
15:35:26:WU00:FS01:Connecting to 155.247.166.220:8080
15:35:26:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE
15:38:03:WU00:FS01:Connecting to 65.254.110.245:8080
15:38:03:WU00:FS01:Assigned to work server 155.247.166.220
15:38:03:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
15:38:03:WU00:FS01:Connecting to 155.247.166.220:8080
15:38:03:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE
15:42:17:WU00:FS01:Connecting to 65.254.110.245:8080
15:42:17:WU00:FS01:Assigned to work server 155.247.166.220
15:42:17:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
15:42:17:WU00:FS01:Connecting to 155.247.166.220:8080
15:42:18:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE
15:49:09:WU00:FS01:Connecting to 65.254.110.245:8080
15:49:09:WARNING:WU00:FS01:Failed to get assignment from '65.254.110.245:8080': No WUs available for this configuration
15:49:09:WU00:FS01:Connecting to 18.218.241.186:80
15:49:09:WARNING:WU00:FS01:Failed to get assignment from '18.218.241.186:80': No WUs available for this configuration
15:49:09:ERROR:WU00:FS01:Exception: Could not get an assignment
16:00:14:WU00:FS01:Connecting to 65.254.110.245:8080
16:00:14:WU00:FS01:Assigned to work server 155.247.166.220
16:00:14:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
16:00:14:WU00:FS01:Connecting to 155.247.166.220:8080
16:00:15:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE
16:18:11:WU00:FS01:Connecting to 65.254.110.245:8080
16:18:11:WU00:FS01:Assigned to work server 155.247.166.220
16:18:11:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
16:18:11:WU00:FS01:Connecting to 155.247.166.220:8080
16:18:11:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE
16:47:13:WU00:FS01:Connecting to 65.254.110.245:8080
16:47:13:WU00:FS01:Assigned to work server 155.247.166.220
16:47:13:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
16:47:13:WU00:FS01:Connecting to 155.247.166.220:8080
16:47:14:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE
17:34:12:WU00:FS01:Connecting to 65.254.110.245:8080
17:34:12:WU00:FS01:Assigned to work server 155.247.166.220
17:34:12:WU00:FS01:Requesting new work unit for slot 01: READY gpu:0:TU102 [GeForce RTX 2080 Ti Rev. A] M 13448 from 155.247.166.220
17:34:12:WU00:FS01:Connecting to 155.247.166.220:8080
17:34:13:ERROR:WU00:FS01:Exception: 10001: Server responded: HTTP_SERVICE_UNAVAILABLE