Sample code in ethereum book won't run, truffle is completely broken with 503 error

[CaledoniaProject]

I'm running the code here: https://github.com/ethereumbook/ethereumbook/tree/develop/code/auction_dapp

> truffle compile
Compiling your contracts...
===========================
✖ Fetching solc version list from solc-bin. Attempt #1
✖ Fetching solc version list from solc-bin. Attempt #2
✖ Fetching solc version list from solc-bin. Attempt #3
Error: Could not find a compiler version matching 0.5.16. Please ensure you are specifying a valid version, constraint or build in the truffle config. Run `truffle compile --list` to see available versions.
    at VersionRange.getSatisfyingVersionFromCache (/usr/local/homebrew/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/dist/compilerSupplier/loadingStrategies/VersionRange.js:134:1)
    at VersionRange.<anonymous> (/usr/local/homebrew/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/dist/compilerSupplier/loadingStrategies/VersionRange.js:54:1)
    at Generator.throw (<anonymous>)
    at rejected (/usr/local/homebrew/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/dist/compilerSupplier/loadingStrategies/VersionRange.js:6:41)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
Truffle v5.4.29 (core: 5.4.29)
Node v14.18.3

Then I tried to list the available versions, and it results in 503 error:

✖ Fetching solc version list from solc-bin. Attempt #1
✖ Fetching solc version list from solc-bin. Attempt #2
✖ Fetching solc version list from solc-bin. Attempt #3
Error: Failed to complete request to: version URLs. Are you connected to the internet?

Error: Request failed with status code 503
    at /usr/local/homebrew/lib/node_modules/truffle/build/webpack:/packages/compile-solidity/dist/compilerSupplier/loadingStrategies/VersionRange.js:198:1
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
Truffle v5.4.29 (core: 5.4.29)
Node v14.18.3

Is truffle completely broken?