Question : Problem: Can anyone help diagnosing this error during a transmission

user is transmitting a file using sftp I believe and this error pops up:

Discarding new request
Opening remote file "/WBHT.TAH.A.04102007.txt" for writing
Uploading local file "g:\ Users\Mike\my.txt"
Server has disconnected for reason 2 (SSH_DISCONNECT_PROTOCOL_ERROR)
"data exceeds window size"
Error 83ef0000 receiving sftp packet
transferred 10839 bytes in 0.070 seconds, 1207.934 Kbps ( 150.992 Kbps), transfer failed.
SFTP Upload Waiting on 1 request status packets, 5415 bytes out ...
Error 83ef0000 receiving sftp packet
Server Window of -16 not enough for data of 14 on channel 0760a2ce
Waiting for 5 seconds for server to adjust channel window
Opening remote file "/WBH.PR.A.04282007.txt" for writing
Server Window of -16 not enough for data of 43 on channel 0760a2ce
Waiting for 5 seconds for server to adjust channel window
Opening remote file "/WBH.EMC.A.05102007.txt" for writing
Server Window of -16 not enough for data of 44 on channel 0760a2ce
Waiting for 5 seconds for server to adjust channel window
Opening remote file "/WBH.EMB.A.05102007.txt" for writing

Answer : Problem: Can anyone help diagnosing this error during a transmission

What speed is your link?  You are only getting 150.922 Kbps, which is fairly slow today.

Is the user sending the file to you, or is the user attempting to get the file from you.

What sftp server are you running?  What sftp client is the user using?