In the Connection - SFTP help page, a link is given for "Other error codes". The link is
https://www.eldos.com/do..._err_sftperrorcodes.html which does not show any other SFTP error codes, but:
A Bright Future for EldoS Products
/n software has acquired all of EldoS Corporation’s products and has formed three new product lines, each carefully designed to best serve you.
Followed by marketing info on their products.