No VPN client account after night

After night I couldn’t conneted throught L2TP/IPsec to my test mikrotik (RouterBOARD 962UiGS-5HacT2HnT). So I connected by RJ45 and saw - It hadn’t have my account. In logs I see some attacks from bots. I don’t have idea how It is possible.
Someone can help me ?
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Version of the routerOS running on that device?

Newest.
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