Why does my setting does not work?

Lab MYPC Server
7000-5900
10800
Internet 10800
15900-5900
Github:22

RINITD runs at lab pc
1081-1080
17000-7000

Test

PCX--vnc-> lab:17000 to connect mypc OK

Pcx:vnc Connect lab:17000 VNC client protocal
LAB:RINITD redirect 17000 to 7000 RINITD tunnel
lab:7000 redirect via ssh tunnel to mypc:5900 SSH tunnel
mypc:5900 is VNC server VNC server protocal

Lab--firefox (using socks) to access internet OK
Lab:firefox Connect to lab:1080 socks client protocal
lab:1080 redirect via ssh tunnel to mypc:10800 SSH tunnel
mypc:10800 is Socks Server socks server protocal
Putty Decode Socks Request and redirect data to MyHome via SSH tunnel

Lab--firefox (using socks 10800) to access Internet fail
Lab:firefox Connect to lab:10800 socks client protocal
LAB:10800 is redirected to lab:1080 via rinetd RINITD Tunnel
lab:1080 redirect via ssh tunnel to mypc:10800 SSH tunnel
mypc:10800 is Socks Server socks server protocal
Putty Decode Socks Request and redirect data to MyHome via SSH tunnel

Why does my setting does not work?