Ledger cache is probably not working as expected

[jleach]

If you log the ledger node cache on line 409 of Splash.tsx it appers to contain defunct nodes when tested with nmap or nc. I think the idea behind the cache is it is mean to cache the reconsiled (know to be good) nodes for a given ledger:

setStep(4)
const cachedLedgers = await loadCachedLedgers()
console.log('************** cached ledgers = ', JSON.stringify(cachedLedgers))
const ledgers = cachedLedgers ?? indyLedgers

Taking two node IPs from the output and testing them with nc shows one to be working and another to be down. If the list was reconciled then one would expect all nodes to be active.

Failed Node on sovrin:test

➜  core git:(main) nc -zv -G 5 52.64.96.160 9702
nc: connectx to 52.64.96.160 port 9702 (tcp) failed: Operation timed out

Active Node on bcovrin:test

➜  core git:(main) nc -zv -G 5 138.197.138.255 9702                
Connection to 138.197.138.255 port 9702 [tcp/*] succeeded!