Octopus Samsung GT-S5603t unlock failed server failed?!

Unlocked this phone successfully long time ago.
But now it try to connect server??!! and always failed.
Tried different computers and different version software.
Any idea and solution for it?
Welcome to Octoplus/Octopus Box Samsung software version 2.3.5
Platform: Samsung Broadcom
Selected port: COM170
Selected model: GT-S5603T
Detected phone model: GT-S5603T
SW version: S5603AJJB3
HW Version: Rev 1.0
Unlocking phone…
Connecting to server…
Phone unlocking failed
Performed by 2.3.5 software version