[SYNC] no peers to connect to

[jasonyic]

harmony version: v4.3.10
try to start a node by connecting to mainnet, with no snapshot. I can see quite a few peers get connected

harmony_1  | {"level":"info","hostID":"QmeiP4UvhrcFQeNnoTYaeZDZMJm2pFBrKQJW7C2v9pfkzv","node":"QmQtcXgV21TDbk3pnvJ6C6r9SXWSrhV2EhbcmXXvojBwdF","caller":"/home/runner/work/harmony/harmony/harmony/p2p/host.go:434","time":"2022-06-22T17:28:16.583666817Z","message":"peer connected"}
harmony_1  | ...

but block is not syncing with the following errors:

harmony_1  | {"level":"debug","len":0,"isBeacon":false,"caller":"/home/runner/work/harmony/harmony/harmony/api/service/legacysync/syncing.go:326","time":"2022-06-22T17:29:53.377022885Z","message":"[SYNC] CreateSyncConfig: len of peers"}
harmony_1  | {"level":"warn","error":"[SYNC] no peers to connect to","peers":[],"caller":"/home/runner/work/harmony/harmony/harmony/node/node_syncing.go:307","time":"2022-06-22T17:29:53.377248096Z","message":"[SYNC] create peers error"}
harmony_1  | {"level":"debug","err":[{}],"length of newTxs":1,"totalPending":0,"totalQueued":0,"caller":"/home/runner/work/harmony/harmony/harmony/node/node.go:234","time":"2022-06-22T17:29:54.564033439Z","message":"[addPendingTransactions] Adding more transactions"}
harmony_1  | {"level":"debug","err":[{}],"length of newTxs":1,"totalPending":0,"totalQueued":0,"caller":"/home/runner/work/harmony/harmony/harmony/node/node.go:234","time":"2022-06-22T17:29:54.902270143Z","message":"[addPendingTransactions] Adding more transactions"}

any suggestion would be helpful. thank you

harmony.config

Version = "2.5.2"

[BLSKeys]
  KMSConfigFile = ""
  KMSConfigSrcType = "shared"
  KMSEnabled = false
  KeyDir = "/harmony/.hmy/blskeys"
  KeyFiles = []
  MaxKeys = 10
  PassEnabled = true
  PassFile = ""
  PassSrcType = "auto"
  SavePassphrase = false

[DNSSync]
  Client = true
  LegacySyncing = true
  Port = 6000
  Server = true
  ServerPort = 6000
  Zone = "t.hmny.io"

[General]
  DataDir = "/data"
  EnablePruneBeaconChain = false
  IsArchival = false
  IsBeaconArchival = false
  IsOffline = false
  NoStaking = false
  NodeType = "validator"
  ShardID = 0
  TraceEnable = false
  #IsBackup = false
  #EnablePruneBeaconChain = false

[HTTP]
  AuthPort = 9501
  Enabled = true
  IP = "0.0.0.0"
  Port = 9500
  RosettaEnabled = false
  RosettaPort = 9700

[Log]
  FileName = "harmony.log"
  Folder = "/harmony/log/latest"
  RotateCount = 0
  RotateMaxAge = 0
  RotateSize = 100
  Verbosity = 3

  [Log.VerbosePrints]
    Config = true

[Network]
  BootNodes = ["/dnsaddr/bootstrap.t.hmny.io"]
  NetworkType = "mainnet"

[P2P]
  DisablePrivateIPScan = false
  DiscConcurrency = 0
  IP = "0.0.0.0"
  KeyFile = "/harmony/.hmykey"
  MaxConnsPerIP = 10
  Port = 9000

[Pprof]
  Enabled = false
  Folder = "/harmony/profiles"
  ListenAddr = "0.0.0.0:6060"
  ProfileDebugValues = [0]
  ProfileIntervals = [600]
  ProfileNames = []

[RPCOpt]
  DebugEnabled = false
  RateLimterEnabled = false
  RequestsPerSecond = 5000

[ShardData]
  CacheSize = 512
  CacheTime = 10
  DiskCount = 8
  EnableShardData = false
  ShardCount = 4

[Sync]
  Concurrency = 6
  DiscBatch = 8
  DiscHardLowCap = 6
  DiscHighCap = 128
  DiscSoftLowCap = 8
  Downloader = false
  Enabled = false
  InitStreams = 8
  MinPeers = 2

[TxPool]
  AccountSlots = 16
  BlacklistFile = "/harmony/.hmy/blacklist.txt"
  RosettaFixFile = ""

[WS]
  AuthPort = 9801
  Enabled = true
  IP = "0.0.0.0"
  Port = 9800