1.Login as studentXX(XX is your machine id)
ssh student@studentXX
2.Then under student, add a user called groupXX (XX is your group num)
sudo add user groupXX
3.Set password for your new user.(eg. student)
4.(under student@studentXX) try to ssh the cocserver:
ssh groupXX@202.45.128.135
5.Type password that you have just set.
6.Then you can do the tunneling:
ssh -Nf -L xxxxxx
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