Windows .exe Login error

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SuzleQ

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Jul 29, 2019
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Hi, when I try to log in through the FTB launcher I get the "Invalid username or password" error. The weird thing is this happened to me last night too. The launcher is set to remember my username and password, and nothing has changed there. Also, I had no problem logging into the minecraft website. I had a friend half way across the country try logging in with my account and it worked for him but still not me. I tried logging in this morning (still didn't change anything) and it logged in no problem. Now I'm trying to log in again and it's not working. Any ideas?
 
I should probably add that I have been playing the unleashed mod all week and haven't had this problem until Saturday night and tonight.
 
I have the same exact problem..

Just can't seem to log in. I was able to like 30 minutes ago, but now it says invalid username or password.

Any help with this please?
 
Ok, so I don't know why this is happening but I do know what worked for me to fix it. I went into my user folder and found the folder that is called AppData. This folder is hidden by default so if you don't see it, go into your view settings and make hidden folders visable. Once in AppData, go into the Roaming folder and delete both the .minecraft and ftbloader folders. Try running FTB.exe. It should work now, at least it did for me. You may not need to delete both minecraft and ftb but I didn't troubleshoot step by step so, if you try it and find you only needed to delete one, let me know.
 
That did not fix it. @ SuzleQ, but thanks. I tried reinstalling FTB several times actually.

What finally fixed the error for me was... TIME.
Therefore I think I know the reason / the problem and even the fix... (for several similar problems of this nature)

1. The reason:
- I was trying to log in with my friend's minecraft account because he said he had forgot his password so I tried several possible ones. That might have resulted me in getting my IP banned for a "certain time".

2. The problem:
-I believe that vanilla minecraft is supposed to give a different error (something in the likes of: you have tried to insert a wrong password too many times or access restricted sth), but FTB just calls it a "login error" and gives the only reason it can: "invalid password/username".
*Disclaimer: I am not yet entirely sure about this and I am not saying that there is such a bug in FTB client. But it COULD be what was happening due to logical deductions from "the reason"

3. The fix:
-After trying a lot of different methods only time helped. If "the problem" is correct, then another fix for this error would be to FTB crew to improve the client. (Again, I am not 100% sure this is the case)

So if any FTB-client modifiers or people who have more knowledge about the coding of the said client happen to stumble upon this topic please let us know if that might have been the case.

Thanks! :)
 
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