Cannot connect to Database attempts hang (no errors)

hi, i have oracle 9.2 on solaris 5.8
weirdly, today we could not connect the db anymore. even these does not work on the server:
sqlplus /nolog
SQL> connect /as sysdba
sqlplus "/ as sysdba"
sqlplus system/**
ALL attemps just hang , no errors.
what can i do?
i think the only way is reboot the machine?
any ideas?

here is the output
bash-2.05# vmstat 2 20
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr f0 m0 m1 m2 in sy cs us sy id
0 0 0 1940080 1012952 9 25 51 0 0 0 0 0 7 5 7 729 777 245 15 3 82
0 0 0 1828840 855200 0 4 0 0 0 0 0 0 386 7 387 5626 62112 3614 25 40 35
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 384 7 384 5611 62299 3786 23 40 37
0 1 0 1828840 855200 0 0 0 0 0 0 0 0 372 6 373 5582 63459 3754 24 39 37
0 2 0 1828840 855200 0 0 0 0 0 0 0 0 391 7 391 5640 63245 3976 23 38 40
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 374 18 374 5789 61626 3760 24 37 3
9
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 373 7 373 5536 62333 3888 20 47 34
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 376 7 376 5585 62463 3594 24 42 35
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 354 8 354 5364 61787 3396 24 41 36
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 378 7 378 5616 61667 3777 18 47 35
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 364 11 364 5494 63075 3616 24 40 3
6
0 2 0 1828840 855200 0 0 0 0 0 0 0 0 388 8 388 5733 62161 3947 22 39 39
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 388 8 388 5702 61873 4142 22 43 35
0 1 0 1828840 855200 0 0 0 0 0 0 0 0 383 7 383 5584 63365 3815 28 33 40
1 0 0 1828840 855200 0 0 0 0 0 0 0 0 387 7 387 5643 63920 3846 29 29 41
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 378 10 378 5650 61793 3914 23 40 3
6
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 388 7 389 5644 62798 4064 24 36 40
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 377 11 377 5592 62206 3941 23 47 3
0
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 379 8 380 5605 61121 3959 21 50 29
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr f0 m0 m1 m2 in sy cs us sy id
0 0 0 1828840 855200 0 0 0 0 0 0 0 0 379 7 379 5511 61964 3549 19 46 35
Also, i cannot connect the database, i dont have any active connections, cannot run any sql statements..

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