No Video Signal on Client PC

[Joce]

TV-Server Version: 3 - Multi seat
MediaPortal Version: MP 0.2.3.0 - RC1
MediaPortal Skin: Blue Two
Windows Version: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.050301-1519)
CPU Type: AMD Sempron(tm) Processor 2600+, MMX, 3DNow, ~1.6GHz
HDD: Maxtor 6L160M0 - 156.3 GB
Memory: 1024MB RAM
Motherboard: K8 Combo-Z
Motherboard Chipset: Ali
Motherboard Bios: Default System BIOS
Video Card: ATI RADEON 9250
Video Card Driver: 6.14.0010.6553
Sound Card: Realtek AC97 Audio
Sound Card AC3: no AC3
Sound Card Driver: 5.10.0000.5650
1. TV Card: Hauppauge Nova-T
1. TV Card Type: DVB-T
1. TV Card Driver: 2.5
2. TV Card: SkyStar 2
2. TV Card Type: DVB-S
2. TV Card Driver: 4.4.1 beta
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: Dscaler
MPEG2 Audio Codec: Ffdshow
Satelite/CableTV Provider: Astra28.2/Eurobird (lnb1) - Astra 19.2 (Lnb 2)
HTPC Case:
Cooling:
Power Supply:
Remote: Hauppauge
TV: Philipps
TV - HTPC Connection:



* TV Server 3 Multi seat configuration
* Client PC connects to server ("centre_media") but cannot detect audio/video signal on any channel.
* Error log only shows: [ERROR][MPMain]: RTSPPlayer:Failed to open file:rtsp://centre_media/stream2.0 :0x80004005
* I have followed the recommendations in the wiki and opened ports/allowed programs in Windows Firewall.

Can someone help me with this ?
Thanks
Joce