Unable to connect: protocol error: rcvd type 255
X-Win32 version 6.1 patch level 3 (i.e. 6.1.3) occasionally reports the following errors on starting a StarNetSSH session using the SSH1 protocol:
- Error: Unable to connect: protocol error: rcvd type 255
Typically this error happened with Solaris hosts that had an older version of sshd.
StarNetSSH in X-Win32 6.1.3 had a problem that caused this error to occur. This problem was fixed in X-Win32 7.0 and later. In addition, X-Win32 8 features an all new SSH connection module that improves stability and speed significantly.

Solutions