I got an WU stuck on sending as well, been that way for a couple of days already. Restarting the client doesn't help, according to the logs, it's doesn't get further than 0,51% upload.
*********************** Log Started 2020-04-04T16:56:49Z ***********************
16:56:50:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
16:56:50:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
16:56:50:WU02:FS01:Connecting to 140.163.4.231:8080
16:57:11:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
16:57:11:WU02:FS01:Connecting to 140.163.4.231:80
16:57:32:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
16:57:32:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
16:57:32:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
16:57:32:WU02:FS01:Connecting to 140.163.4.231:8080
16:57:53:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
16:57:53:WU02:FS01:Connecting to 140.163.4.231:80
16:58:14:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
16:58:32:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
16:58:32:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
16:58:32:WU02:FS01:Connecting to 140.163.4.231:8080
16:58:53:WU02:FS01:Upload 0.51%
16:58:53:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
17:00:09:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
17:00:09:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
17:00:09:WU02:FS01:Connecting to 140.163.4.231:8080
17:01:47:WU02:FS01:Upload 0.51%
17:01:47:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
17:02:46:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
17:02:46:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
17:02:47:WU02:FS01:Connecting to 140.163.4.231:8080
17:02:54:WU02:FS01:Upload 0.26%
17:04:31:WU02:FS01:Upload 0.51%
17:04:31:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
17:07:01:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
17:07:01:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
17:07:01:WU02:FS01:Connecting to 140.163.4.231:8080
17:07:22:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
17:07:22:WU02:FS01:Connecting to 140.163.4.231:80
17:07:43:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
17:13:52:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
17:13:52:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
17:13:52:WU02:FS01:Connecting to 140.163.4.231:8080
17:14:13:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
17:14:13:WU02:FS01:Connecting to 140.163.4.231:80
17:14:34:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
17:24:58:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
17:24:58:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
17:24:58:WU02:FS01:Connecting to 140.163.4.231:8080
17:25:19:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
17:25:19:WU02:FS01:Connecting to 140.163.4.231:80
17:25:40:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
17:42:55:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
17:42:55:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
17:42:55:WU02:FS01:Connecting to 140.163.4.231:8080
17:44:34:WU02:FS01:Upload 0.51%
17:44:34:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
18:11:57:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
18:11:57:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
18:11:57:WU02:FS01:Connecting to 140.163.4.231:8080
18:12:18:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
18:12:18:WU02:FS01:Connecting to 140.163.4.231:80
18:12:40:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
18:58:56:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
18:58:56:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
18:58:56:WU02:FS01:Connecting to 140.163.4.231:8080
18:59:17:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
18:59:17:WU02:FS01:Connecting to 140.163.4.231:80
18:59:38:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
20:14:56:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
20:14:56:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
20:14:56:WU02:FS01:Connecting to 140.163.4.231:8080
20:15:18:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
20:15:18:WU02:FS01:Connecting to 140.163.4.231:80
20:15:39:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
22:17:56:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
22:17:56:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
22:17:56:WU02:FS01:Connecting to 140.163.4.231:8080
22:19:36:WU02:FS01:Upload 0.51%
22:19:36:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
******************************* Date: 2020-04-04 *******************************
01:36:56:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
01:36:56:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
01:36:56:WU02:FS01:Connecting to 140.163.4.231:8080
01:37:17:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
01:37:17:WU02:FS01:Connecting to 140.163.4.231:80
01:37:38:WARNING:WU02:FS01:Exception: Failed to send results to work server: Failed to connect to 140.163.4.231:80: Een verbindingspoging is mislukt omdat de verbonden party niet correct heeft geantwoord na een bepaalde tijd, of de gemaakte verbinding is mislukt omdat de verbonden host niet heeft geantwoord.
******************************* Date: 2020-04-05 *******************************
06:58:56:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
06:58:56:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
06:58:56:WU02:FS01:Connecting to 140.163.4.231:8080
06:59:18:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
06:59:18:WU02:FS01:Connecting to 140.163.4.231:80
06:59:18:WU02:FS01:Upload 0.26%
06:59:38:WU02:FS01:Upload 0.51%
06:59:38:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
******************************* Date: 2020-04-05 *******************************
12:58:56:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
12:58:56:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
12:58:56:WU02:FS01:Connecting to 140.163.4.231:8080
12:59:18:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
12:59:18:WU02:FS01:Connecting to 140.163.4.231:80
12:59:18:WU02:FS01:Upload 0.26%
12:59:38:WU02:FS01:Upload 0.51%
12:59:38:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed
******************************* Date: 2020-04-05 *******************************
18:58:57:WU02:FS01:Sending unit results: id:02 state:SEND error:NO_ERROR project:11752 run:0 clone:10989 gen:1 core:0x22 unit:0x000000028ca304e75e6d6da989a388e0
18:58:57:WU02:FS01:Uploading 24.34MiB to 140.163.4.231
18:58:57:WU02:FS01:Connecting to 140.163.4.231:8080
18:59:18:WARNING:WU02:FS01:WorkServer connection failed on port 8080 trying 80
18:59:18:WU02:FS01:Connecting to 140.163.4.231:80
18:59:33:WU02:FS01:Upload 0.26%
19:00:41:WU02:FS01:Upload 0.51%
19:00:41:WARNING:WU02:FS01:Exception: Failed to send results to work server: Transfer failed