- you set a wrong host name or IP address
I tried both my dynamic DNS address (external) and my computer's local address. I can get to my local apache webserver no problem, so the PSP is on the network and can access the computer... However, when I put in the VNC port, it says there is a server error.
- you set a wrong port number (it should be 5900 or 5901)
I've tried with about 10 different port numbers (including 5900 and 5901, but also 28000 and a bunch of others). With each change I have updated the VNC server client, the corresponding ports on my router and the PSP. In any case, as of now, I'm back to using 5901.
- there is a firewall
Nope. I don't have any sort of firewall active on the router nor on my computer. Disabled across the board.
- your vnc server is not launched
According to the Activity Monitor (OS X's task manager), the server is running. If I type in the local address in my web browser, I get the proper response ("RFB 003.008") and it works from my other computers...
Does the RFB protocol matter? Right now it is set at Default (3.8), but I can change it to 3.7 or 3.3 if necessary.
UPDATE: It seems that now I am getting a different error message... in that the VNC server is declared to be a "not valid VNC server", followed by "ERROR: cannot initialize".