ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

Error
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Anki 2.1.22 (0ecc189a) Python 3.8.0 Qt 5.14.1 PyQt 5.14.1
Platform: Windows 10
Flags: frz=True ao=False sv=1
Add-ons, last update check: 2020-06-26 17:38:53


Exception happened during processing of request from (‘127.0.0.1’, 55590)

Exception happened during processing of request from (‘127.0.0.1’, 55591)

Exception happened during processing of request from (‘127.0.0.1’, 55589)
----------------------------------------Traceback (most recent call last):
File “socketserver.py”, line 650, in process_request_thread
File “socketserver.py”, line 360, in finish_request
File “http\server.py”, line 646, in init
File “socketserver.py”, line 720, in init
File “http\server.py”, line 426, in handle
File “http\server.py”, line 414, in handle_one_request
File “aqt\mediasrv.py”, line 80, in do_GET
File “aqt\mediasrv.py”, line 122, in send_head
File “http\server.py”, line 528, in end_headers
File “http\server.py”, line 532, in flush_headers
File “socketserver.py”, line 799, in write
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

Exception happened during processing of request from (‘127.0.0.1’, 55593)
Traceback (most recent call last):
File “socketserver.py”, line 650, in process_request_thread
File “socketserver.py”, line 360, in finish_request
File “http\server.py”, line 646, in init
File “socketserver.py”, line 720, in init
File “http\server.py”, line 426, in handle
File “http\server.py”, line 414, in handle_one_request
File “aqt\mediasrv.py”, line 80, in do_GET
File “aqt\mediasrv.py”, line 122, in send_head
File “http\server.py”, line 528, in end_headers
File “http\server.py”, line 532, in flush_headers
File “socketserver.py”, line 799, in write
Traceback (most recent call last):
File “socketserver.py”, line 650, in process_request_thread
File “socketserver.py”, line 360, in finish_request
File “http\server.py”, line 646, in init
File “socketserver.py”, line 720, in init
File “http\server.py”, line 426, in handle
File “http\server.py”, line 414, in handle_one_request
File “aqt\mediasrv.py”, line 80, in do_GET
File “aqt\mediasrv.py”, line 122, in send_head
File “http\server.py”, line 528, in end_headers
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

File “http\server.py”, line 532, in flush_headers
File “socketserver.py”, line 799, in write
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

Traceback (most recent call last):
File “socketserver.py”, line 650, in process_request_thread
File “socketserver.py”, line 360, in finish_request
File “http\server.py”, line 646, in init
File “socketserver.py”, line 720, in init
File “http\server.py”, line 426, in handle
File “http\server.py”, line 414, in handle_one_request
File “aqt\mediasrv.py”, line 80, in do_GET
File “aqt\mediasrv.py”, line 122, in send_head
File “http\server.py”, line 528, in end_headers
File “http\server.py”, line 532, in flush_headers
File “socketserver.py”, line 799, in write
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

It’s likely your firewall or antivirus program: https://faqs.ankiweb.net/error-establishing-a-secure-connection-when-syncing.html