Greetings!
I stuck on trying to solve this problem. What I've used and done:
1. Latest rAthena Version. Pulled from Github
2. 2015-11-04aRagexe Client, diffed using the latest NEMO. Thanks to @Secrets (Note: I enable "the packet obfuscation" option because I also enable it in packets.h)
3. Edited src/config/packets.h
4. Uncomment #define VIP_ENABLE in src/config/core.h
5. Add #define PACKETVER 20151104 in src/custom/defines_post.h
6. Compiled the server and run it.
7. The console works perfectly without any Error notification. All Green.
8. I run the diffed.exe, select the service, put the username and password, and LOGGED IN (the window shows "... players online")
9. After clicking it, a window popped up and said "Rejected from Server". I cannot go to char creation window.
10. I checked the char-server console, it said "Char-server 'ragnarok': authentication of the account 2000005 REFUSED (ip: 127.0.0.1)."
Very welcome to anyone can help this problem. Thank you.