Technic Blog

"Bad login" error on some older modpacks

You might have received a "Failed to login: Bad login" error when trying to connect to a server on some older modpacks. This is because Mojang has disabled their old authentication servers (, which means that Minecraft versions older than 1.6 can't authenticate anymore. For example: Tekkit Classic.

If you're running a Minecraft server for these versions, the only workaround right now is to set your server to offline mode (online-mode=false) via the file located in the root of the server folder, which will disable all authentication, so it's highly recommended to install a plugin like AuthMe ( so your players are at least acceptably safe.

This issue is listed on Mojang's bug tracker at


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Older then 1.6? 1.5.2 is still working with the offline servers Legacy editions grown are from time at the 1.3/1.4 Java times idk if older then 1.5.2 works but 1.5.2 still working (1.5.2) 1.5.2 modpack client with server (CraftBukkit version git-MCPC-Plus-jenkins-MCPC-Plus-Legacy-653 (MC: 1.5.2) (Implementing API version 1.5.2-R1.1-SNAPSHOT))
BluePeer 1 week ago
But how should we install plugins on a modpack server? I cant seem to find a way how to install mods and Plugins, there was an old "mod" that made it possible but its not aviable anymore :/
SkyPlayz 1 week ago
It'd depend on which modpack it is, and what version of Minecraft it runs. Tekkit Classic natively supports plugins with CraftBukkit++. Tekkit Lite and some others do not natively support plugins, but support can be added by using something like Cauldron or another Forge + Bukkit combination.
Posted by TheKdub 5 days ago
Ata1192 1 week ago
this is Fu***** annoying... :3
NickerdeNick 1 week ago
I have 2 computers a laptop and a monitor. I can open technic on both the laptop and monitor and pick the modpack I want the play. But then when the Mojang screen shows up and the mods start to load. Technic will not load when I bring it to my monitor. But it will load just fine on my computer. None of my other games have this problem so I'm assuming its technic and I have tried just about everthing and I was wondering if anyone has some advice for me please?
5150Monkey 6 days ago
im running a virtual lan server with my friend for blightfall (1.7.10) yet we get the same problem. is that version affected too?
ballspenis 6 days ago
Thank you for misinforming the community about this issue. The ticket linked in your post ( is regarding login servers for alpha and beta versions of Minecraft. Not pre-1.6 release versions of Minecraft. Tekkit Classic and other older modpacks are NOT affected by those alpha and beta login servers being shut down. Mojang has not shut down, and has not indicated that they will be shutting down login or session servers for Minecraft pre-1.6.
TheKdub 5 days ago
This doesn't explain why can't I log in?
GreenieBeanie 3 days ago
GreenieBeanie, if you can't log into the launcher, double check that you typed your email address and password correctly. You might need to also try going to and log in there to see if that works. If you're having issues joining a server, it'd depend on what error you're getting. If it's a "Bad Login" error, that means that either Mojang's servers are down, or that you're logged into your Minecraft account in more than one place. Make sure that you only have one copy of Minecraft open. If you only have one copy open, and don't share your account with anyone else who might be logged into it, but other people are still able to join that same server, I'd suggest changing your password as your account could have been compromised. Other possibilities are the server's whitelisted and you're not on the whitelist, the server's full, the IP you entered is incorrect, or the server you're trying to connect to is offline. Sometimes Minecraft will glitch out a bit when trying to join a server and refuse to let you join it even when the server is up and accepting players. Usually that can be fixed by joining another server, joining a single player world, or restarting your game.
Posted by TheKdub 22 hours ago
Can u please help. I cant do this, because i didnt understand yet! Please someone can help me!!?
Guta 15 hours ago
im trying to play a modpack whos name is "future era 2" and i cant play online with friends! Can someone help me?
Guta 15 hours ago