SFTP Unable to send FXP_OPEN error

Hi all,

I've a problem with EnsLib.FTP.OutboundAdapter

I've configured this adapter using a SFTP connection, it has been working the first time but now its raising the following error message:

ERROR <Ens>ErrFTPPutFailed: FTP: error al colocar archivo '1600000107279008930.pdf' (mensaje='Error in SFTP Put('C:\stream\QhFaDm4L1Jrgbg.stream','mypath/1600000107279008930.pdf') ERROR #7500: Error SSH '-2146430933': SSH Error [8010102B]: Unable to send FXP_OPEN* [8010102b] at SFTP.cpp:539,0',código=0)

This is part of my code:

    try {
        set name = pRequest.FileName
        set ..Adapter.FilePath = pRequest.FilePath

        set tSC = ..Adapter.PutStream(name, pRequest.DocBase64)
        if $$$ISERR(tSC) $$$ThrowStatus(tSC)

    } catch ex {
        set ret = ex.AsStatus()
    }
    
    quit ret

is there any idea about this error?

Thanks in advance

Kurro