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Adobe Flash Builder can no longer connect to Flash Player debugger in Firefox on Win 10 - what can I do to get them to communicate again?

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I have a legacy Flex project that I support in Adobe Flash Builder 4.7. I recently returned to this project after not working in it for about 6 months and I can no longer run the project locally in 'debug' mode which launches it into the Firefox browser. The communication between Flash Builder and the browser times out and I get the following message.

`The Flash Builder debugger failed to connect to the running application. Ensure that: 

   1. For in-browser applications, you are running the debugger version of Flash Player.
   2. For network debugging on a mobile device, you have a reliable network connection to the device, and port 7935 is open on your machine's firewall.
       Device connection help`

I have installed the latest Flash Player debugger version (27,0,0,130 ). Any thoughts would be appreciated as I need to debug an issue asap.

I have a legacy Flex project that I support in Adobe Flash Builder 4.7. I recently returned to this project after not working in it for about 6 months and I can no longer run the project locally in 'debug' mode which launches it into the Firefox browser. The communication between Flash Builder and the browser times out and I get the following message. `The Flash Builder debugger failed to connect to the running application. Ensure that: 1. For in-browser applications, you are running the debugger version of Flash Player. 2. For network debugging on a mobile device, you have a reliable network connection to the device, and port 7935 is open on your machine's firewall. Device connection help` I have installed the latest Flash Player debugger version (27,0,0,130 ). Any thoughts would be appreciated as I need to debug an issue asap.