I'm interested, what is the RC environment actually? My first guess would be Release Candidate but I could be wrong.
Could you please post the details to get this working? I tried to log in earlier and every time I changed NP environment to RC and rebooted, it would say "NP Environment: Invalid"
Every time I try to connect, I also get error 80710A06 (the same error saying PSN is down). Afaik, psn isn't down, so my system must not be accepting these alternate NP environments in the first place.
edit: The only environments my ps3 will allow are SP-INT, MGMT, PROD-QA, and NP, absolutely everything else returns as invalid.