Errors on Windows and Mac build possibly due to failed code signing

[hans-permana]

Expected behavior

Builds should pass without any errors and Windows & Mac installers should be signed.

Actual behavior

Builds produced an error:

Unhandled rejection Error: connect ECONNREFUSED 127.0.0.1:443
    at Object._errnoException (util.js:992:11)
    at _exceptionWithHostPort (util.js:1014:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
From previous event:
    at CancellationToken.createPromise (/Users/travis/build/CCI-Tools/cate-installer/cate-desktop/node_modules/builder-util-runtime/src/CancellationToken.ts:51:5)
    at /Users/travis/build/CCI-Tools/cate-installer/cate-desktop/node_modules/builder-util/src/nodeHttpExecutor.ts:23:44
From previous event:
.
.
.
.

Complete logs can be viewed here (Mac) and here (Windows).

Also, the resulting installers did not seem to be signed, prompting some security confirmation from users when executed.

Specifications

• electron-build version: 19.56.2
• electron-updater version: 2.20.1

[hans-permana]

Reported the issue here electron-userland/electron-builder#3121 due to a suspicion that it may be an electron builder issue.

[forman]

Problem was at Dropbox, where we host the certificates. The Dropbox download URL parameter suddenly stopped working.

Fix:

CSC_LINK=https://www.dropbox.com/**/*.p12?dl=1

had to be turned into

CSC_LINK=https://dl.dropbox.com/**/*.p12