Testnet full node is launched & working but not syncing

I’ve setup from source and launched the Testnet full node using this manual - Run a Sui Full node | Sui Docs, but when I’m using following command:
curl -X POST 127.0.0.1:9000 -H 'Content-Type: application/json' -d '{ "jsonrpc": "2.0", "id": 1, "method": "sui_getTotalTransactionNumber", "params": [] }'
…it shows:
{"jsonrpc":"2.0","result":2,"id":1}
So looks like my node is working, but not syncing.

Could anyone help me to fix the issue?

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Thanks @Pyzz , but I don’t want to open ports
Also, why I should use any external tools instead of using native commands?