For legacy, I cannot join, the console says auth failed, username denied (steam64id)

Tried reinstalling multiple times. But I wish to try out experimental now. here is my error code when trying to join my experimental server. which results in automatic server crash.

Unity Player [version: Unity 5.0.0b14_beea3a590379]

CSteamworks.dll caused an Access Violation (0xc0000005)
in module CSteamworks.dll at 0033:f61c35c1.

Error occurred at 2014-12-05_122114.
F:\rust_dedicated\RustDedicated.exe, run by Administrator.
63% memory in use.
4088 MB physical memory [1486 MB free].
4286 MB paging file [391 MB free].
8388608 MB user address space [8387880 MB free].
Read from location 00000000 caused an access violation.
I am experienced host, not sure why this is happening.

Edited:

I did assign my 64id as ownerid, if that matters.

Edited:

I got legcy working with no issues when it first got released on the same machine. Not sure what has changed. The legacy version says wrong gme, even though both server and client are both legacy......

But experimental is super crashing when I try to join.