Fellow Shooters,
I came across a, not uncommon, couple of issues that have easy fixes ... sharing here for your general awareness.
Potential Issues:
1. You repeatedly get the "Incorrect Password" from a server, AND you are 100% sure it's the right server and right password
2. You repeatedly get stuck at X% download of the mods for the server
Remedies that Work:
1. (Non-destructive, quick) Run an integrity check on your Reforger files (corrupt files do happen)
How to: https://youtu.be/XCrx5fu2c_k
<<AND, OR>>
2. (Destructive, a bit slower) Delete all the existing mods and log back into the server
These are numbered folders here: C:\Users\[uname]\Documents\My Games\ArmaReforger\addonsv/r
SGT M. Jaeger
[This is not an official S-4 post.]