I set the SendBuff to 0 and now the file is being uploaded successfully, very strange since I had that set before and received the same error. I'm beginning to suspect that it may have been an issue on our network side as some work was done on that over the weekend. I'll continue to monitor and if it errors out again I'll append the code and associated logs to this thread.

Thank you for your assistance on this

OK, but can you post logs (and code) with the SendBuf set?

Here are the requested log files

Please attach a full session log file showing the problem (using the latest version of WinSCP).

I'm getting the error Software caused connection to Abort but I'm unsure as to why I'm getting it. The process runs and creates a 0KB file on the SFTP server but then it times out. The file I'm attempting to load is 31KB. The log file shows that it reaches 30KB, then it stops. I've tried turning of the Optimization buffer with the same results. Below are the Raw Settings i used in the SessionOptions but none of those helped.

sessionOptions.AddRawSettings("PingIntervalSecs", "5");
sessionOptions.AddRawSettings("PingType", "2");
sessionOptions.AddRawSettings("SendBuf", "0");
sessionOptions.AddRawSettings("SshSimple", "0");

Any assistance would be greatly appreciated. I'm using the .Net Assembly WinSCP Version 5.13.7 Build 9125