I install the solaris 8 in my server but i can only access the server by console i can't acces by telnet or ftp, i try to edit the login file but i can't the vi editor saves ok the changes but when i edit it again it's just like no changes were made.

Thanks for the help.

I thought I answered this already. Your difficulty is not with your Sun machine but your inability to make changes with vi to a file that does not have write priviledges. If you can't do it a different way, try this

chmod ugo+w /etc/default/login
vi /etc/default/login

make your changes

ESCAPE wq!

reboot

You can also use sed to make changes to a file if vi is to difficult for you.

sed -e 's/^CONSOLE/#CONSOLE/' /etc/default/login > /tmp/login
mv /tmp/login /etc/default/login

You could try this
Type in env
Note the value of TERM
(This needs changeing, most likely default to sun)
Type in TERM=dtterm
Type in export TERM