We've recently switched from openssh to tectia and now are experiencing some weird logins that replace the / to a . and cause permissions issues.
For example:
Welcome to Core FTP, release ver 2.1, build 1649 (U) -- © 2003-2010
WinSock 2.0
Mem -- 2,097,151 KB, Virt -- 2,097,024 KB
Started on Tuesday January 25, 2011 at 07:32:AM
Resolving Sftp.site.com...
Sftp.site.com connecting...
SSH-2.0-6.1.8.136 SSH Tectia Server
client -> any
server -> any
ssh-rsa
PWD
Current directory is '.'
Keep alive off...
Transferred 415 bytes in 0.001 seconds
CWD .Temp
permission denied...