Cannot program cyclone IV with USB blaster

Hello,

I am facing a very similar problem with my Cyclone IV FPGA board and would appreciate some guidance.

My hardware is:

- FPGA: Altera/Intel Cyclone IV E EP4CE6E22

- FPGA board: Cyclone IV development board

- Operating System: Windows 11 64-bit

- Quartus Prime / Quartus Programmer: 21.1

- Programmer: Altera USB-Blaster

The USB-Blaster is detected by Windows Device Manager. However, Quartus Programmer cannot detect the FPGA through JTAG.

When I run:

jtagconfig

I get:

Error when scanning hardware - Server error

Quartus Programmer also reports:

"Attempted to access JTAG server -- internal error code 82 occurred"

I checked the JTAG Server and found the following:

jtagserver --status

Server is running

Remote clients are disabled

However, when I run:

jtagserver.exe --foreground

I get:

Unable to bind changedetect socket: 10048

Can't bind to TCP port 1309 - exiting

I then checked port 1309 using:

netstat -ano | findstr 1309

and got:

TCP 0.0.0.0:1309 0.0.0.0:0 LISTENING 4928

UDP 127.0.0.1:1309 127.0.0.1:1309 4928

So port 1309 is currently being used by PID 4928.

I have already tried:

- Reinstalling the USB-Blaster driver

- Installing the driver manually from the Quartus driver directory

- Trying different USB ports

- Restarting the PC

- Disconnecting the FPGA and testing the USB-Blaster separately

- Reinstalling/restarting the JTAG Server

- Checking the JTAG Server status

- Checking TCP port 1309

- Running the commands as Administrator

The USB-Blaster is detected by Windows, but Quartus still cannot communicate with it through the JTAG Server.

I would like to know if anyone has experienced this issue with Cyclone IV EP4CE6E22 on Windows 11.

Could someone please advise me on:

1. What exactly could be using port 1309?

2. How can I safely identify and remove the process/service occupying port 1309?

3. Is there a known JTAG Server compatibility issue with Quartus Programmer 21.1 and Windows 11?

4. Should I use a different Quartus Programmer version?

5. Is there anything else I should check on the USB-Blaster/JTAG connection?

I would really appreciate any help or suggestions.

Thank you.