Yeah this is caused by some windows update. Basically windows started to restrict ports.
So You need to find any other PC/Laptop that is able to run that tool without this error.
Also make sure that You have enabled ONLY ONE network interface. So if you are using ethernet then disable wifi and vpns / teamviewer interfaces etc.
Then You need to use your current tool to upgrade SRRv2 firmware (You have version hardware v2 right ? Dont run it on v1 if you have it)
https://download.simplemining.net/SRR/Tool/10.0.0.18/SRRTool.exe
Upgrade SRRv2 to 1.5 using this firmware file: https://download.simplemining.net/SRR/Firmware/SimpleRigReseter-v1.5.hex
After process is completed (wait 1 minute) and close that old tool. Download newer tool
https://download.simplemining.net/SRR/Tool/10.0.0.19/SRRTool.exe
And just connect. It will work normally always under any windows from now on.
Please let me know if all went well.