you need to create a DWORD at HKLMSystemCurrentControlSetServicesLanmanWorkstationParameters with key DisableLargeMtu and set the value to 0, then reset the computer.
DSM4.2 新功能之SMB2 and Large MTU
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you need to create a DWORD at HKLMSystemCurrentControlSetServicesLanmanWorkstationParameters with key DisableLargeMtu and set the value to 0, then reset the computer.