System start issue.

Hello,
Our SAP system is up and database is also up. We can see all the processes using ps -ef.
However, when we try connecting through SAP GUI, it gets stuck at 'Waiting for Response..'
Its a dual stack system. I have checked startsap_DVEBMGS01.log startsap_SCS02.log std_server0.out  etc... they are all fine.
Please advise

Juan, there is enough free space in teh database filesystem.
Suresh,
This is display of dpmon. Please help me understanding it..
No Ty. Pid      Status  Cause Start Err Sem CPU    Time  Program  Cl  User
0 DIA   757896 Run           yes     0   0        80948SAPMHTTP 000 SAPSYS
1 DIA   930004 Ended         no      0   0        80948SAPMHTTP 000 SAPSYS
2 DIA   835754 Run           yes     0 -33        80948SAPMHTTP 000 SAPSYS
3 DIA   938210 Ended         yes     0   4        80948         000 SAPSYS
4 DIA   925920 Run           yes     0   0        80948         000 SAPSYS
5 DIA   798862 Run           yes     0  33        80943         100 9757F4061F1
6 DIA   782516 Down          yes     0   4        0
7 DIA   807066 Down          yes     0   4        0
8 UPD   819360 Down          yes     0   4        0
9 UPD   868564 Down          yes     0   4        0
10 UPD   454810 Down          yes     0   4        0
11 ENQ  1241246 Down          yes     0   4        0
12 BTC  1089688 Down          yes     0   4        0
13 BTC  1196220 Down          yes     0   4        0
14 BTC   884846 Down          yes     0   4        0
15 SPO   975090 Down          yes     0   4        0
16 UP2   389126 Down          yes     0   4        0
17 UP2   458788 Down          yes     0   4        0

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