Just checked one server which is running old node version Cardano Node 8.9.0 and i can see it has stuck and stopped syncing at 1st september. Are any old node versions invalidated now?
bam@nsserver:~$ cardano-cli query tip --mainnet
{
"block": 10781330,
"epoch": 506,
"era": "Babbage",
"hash": "e757d57eb8dc9500a61c60a39fadb63d9be6973ba96ae337fd24453d4d15c343",
"slot": 133660799,
"slotInEpoch": 431999,
"slotsToEpochEnd": 1,
"syncProgress": "99.80"