SharpCifs.Smb.SmbException : This client does not support the negotiated dialect.

[bonnlee2016]

hello, everyone

I tried to connect to the target file，using new SmbFile("smb://{userName}:{password}@{serverIp}/{shareName}").
The test was successful two weeks ago and failed today.

What is the reason for this anomaly.

Error description: SharpCifs.Smb.SmbException : Failed to connect, 0.0.0.0<00>/192.168.1.20 [ 192.168.1.16:62452 --> 192.168.1.20:445 ] ---- SharpCifs.Util.Transport.TransportException : This client does not support the negotiated dialect. -------- SharpCifs.Util.Transport.TransportException : This client does not support the negotiated dialect. ------------ SharpCifs.Smb.SmbException : This client does not support the negotiated dialect.

Thank U.