This error happens when using the Century FTP Client that came with TinyTERM Plus versions 4.11 and earlier over a VPN. It’s fixed with the patch available here.

To use the patch, locate the existing ftpslave.exe file on your PC. Rename it as a backup, then copy this file into the same directory. The next time you start the Century FTP Client, the patch will be in effect.

This patch does not work with SecureFT.

CR 100, fixed in TinyTERM Plus 4.12 .