transfer data (securely) within an protected network via RPC/SSL/...?

Hello,
Our software should transfer data between clients in a LAN.

How to transfer data (securely) within an firewall protected office
network?
The admin doesn't need to change firewall or any other settings, if
possible.

Which protocol/service prefered by admins?
- RPC (but W32 Blaster Worm uses vulnerability in RPC)
- Named Pipe (but not available if file and printer sharing is
disabled)
- TCP/IP (but in general admin have to open ports firewall manually)
- SNMP
- SSL
- SSH

Any help is highly apperciated.

Mario

.

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