I wouldn't ask this question at all if I can go directly to server2 from pc1.
I appreciate your help, but please, if you do not have a better idea, spare me of your answers.
I have tried the following:
on PC1 (win xp) I have created ssh connection with port forwarding
(local 8888 to remote 8888) to server1.
>From server1 I have created another ssh connection...