Can connect to database on network but not through VPN

oracle 10g/11g
windows 2003/2008
juno pule vpn
Hi,
When I'm on the office network I can sqlplus and remote desktop to to database server, but on the VPN I can't connect with sqlplus or remote desktop, but I can tnsping.
How can this be??

Hi Guys,
Hope some of you are still following this thread.
Spoke to the network guys and they are at a loss. They say that port 1521 is allowed through the vpn and firewall.
When I try to connect over the new JUNOS PULSE SVPN, I see in the listener log file that it established connection, but I think it can't see the client after it is allocated the temp listener port?
Any suggestions please?
In listener.log
===============
05-SEP-2012 20:38:06 * (CONNECT_DATA=(SERVICE_NAME=EOH_CRM_PRD)(failover_mode=(type=SESSION)(method=BASIC))(SERVER=DEDICATED)(CID=(PROGRAM=C:\oracle\app\product\11.2.0\client_1\bin\sqlplus.exe)(HOST=DBAVM)(USER=Van))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.12.200.45)(PORT=52940)) * establish * EOH_CRM_PRD * 0
Fatal NI connect error 12170.
VERSION INFORMATION:
     TNS for 32-bit Windows: Version 10.2.0.2.0 - Production
     Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 10.2.0.2.0 - Production
     Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 10.2.0.2.0 - Production
Time: 05-SEP-2012 20:39:07
Tracing not turned on.
Tns error struct:
ns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12606
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: <unknown>

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