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GitHub
github.com › FTBTeam › FTB-Server-Installer › issues › 11
[Bug]: FTB Evolution Server Installer Not Working · Issue #11 · FTBTeam/FTB-Server-Installer
Log Files ftb-server-installer.log Describe the issue Error messages when trying to run the server installer, deleted and re-installed multiple times. failed to download files. 'All mirrors failed' Steps to reproduce run the server insta...
Author   FTBTeam
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Reddit
reddit.com › r/feedthebeast › server installation failed
r/feedthebeast on Reddit: Server installation failed
May 28, 2020 -

[SOLVED] I tried to install a FTB Ultimate reloaded server on my ubuntu machine today. In the launcher I downloaded the serverinstall_36_38 file that should be for linux computers. Then after I tried to run the server installation file I go this error message

: [81/510] Downloaded 'options.txt' to './config/defaultoptions/' [1437 bytes]...

Fatal error: PosixJavaThreads.start0: pthread_create

I hava Java 11 installed anyone knows how to fix this?

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Feed The Beast
forum.feed-the-beast.com › forums › servers › server admin area › server tech support
Problem - FTB forge installer not working | Feed The Beast
February 18, 2021 - When installing server files from .exe i downloaded from the FTB website(FTB revelations) it downloads everything but stops at installing forge. When i look at logs it tells me " Downloading Minecraft server failed, invalid e-tag checksum. Try again, or manually place server jar to skip...
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CubeCoders Support
discourse.cubecoders.com › technical support › installation support
FTB Evolution Server install problems - Installation Support - CubeCoders Support
November 30, 2024 - System Information Field Value Operating System Linux - Debian GNU/Linux 12 on x86_64 Product AMP ‘Phobos’ v2.6.0.6 (Mainline) Virtualization Docker Application Minecraft Module MinecraftModule Running in Container Yes Current State Stopped Problem Description Issue Can’t get server to run so client can join from official FTB app Reproduction Steps start new minecraft instance select FTB new source, FTB Evolution 1.3.0 client can’t connect (server version 1.21.3)
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GitHub
github.com › FTBTeam › FTB-Modpack-Issues › issues › 1100
[Bug]: Windows Server installer doesn't work right · Issue #1100 · FTBTeam/FTB-Modpack-Issues
July 11, 2022 - Modpack FTB Direwolf20 Modpack version 1.18 Log Files No response Describe the bug There is an issue when using the Windows server installer serverinstall_95_2233.exe I've seen a number of people ask in various places but not seen it add...
Author   FTBTeam
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GitHub
github.com › FTBTeam › FTB-Server-Installer
GitHub - FTBTeam/FTB-Server-Installer · GitHub
./serverinstaller -pack <pack_id> -version <version_id> ... ID of the modpack version you would like to install, if not set, latest stable release will be selected
Author   FTBTeam
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Reddit
reddit.com › r/feedthebeast › problem with ftb modpack server files installer
r/feedthebeast on Reddit: Problem with FTB modpack server files installer
May 6, 2024 -

Hi, I am very new to anything server-related, but I am trying my best to set up a server for me and my friend to play on. My machine is quite powerful, and I believe it will be capable of running the server alongside the FTB client. Unfortunately, I have encountered an issue with the FTB server files installer, and I am at my wit's end trying to figure out what is going wrong. For reference, I am running Windows 11 Home version 23H2. Here is what I have done:

  1. I have downloaded the Windows server files installer from the FTB server files page (here). I have tried this for 3 separate modpacks (Direworlf20 1.20, FTB Endeavour, and FTB University 1.19 - all have produced the same problem).

  2. I placed the installer in the folder in which I wish for my server files to be installed.

  3. Opened the installer.

  4. This opens a cmd box. I am prompted wth a message asking me what in what directory I would like to install my files. I press enter, to set the directory as the current directory (the directory of the installer).

  5. I am then prompted with "Path already exists - still want to install [y/n]?". I enter "y".

  6. I am then prompted with "Continuing will install FTB Unstable 1.20: Forge version 1.5.0. Do you wish to continue? (y/n) [y]". I enter "y".

  7. The dialogue box then closes within about 5 seconds. Within that 5 seconds, the following lines appear.

Performing installation...

Getting downloads for NeoForge Install

JSON not on server and unable to get forge jar:

hhtps://maven.neoforge.net/releases/net/neoforged/forge/1.20.1-47.1.84/forge-1.20.1-47.1.84.json

hhtps://maven.neoforge.net/releases/net/neoforged/forge/1.20.1-47.1.84/forge-1.20.1-47.1.84.jar open forge-1.20.1-47.1.84-installer.jar: Access is denied.

No files have been installed in the folder where they are supposed to be installed, and nothing else at all happens once the dialogue box closes.

If anyone has any experience with this issue or any advice, that would be greatly appreciated!

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GitHub
github.com › FTBTeam › FTB-App › issues › 734
[Bug]: Server installer does not install everything, start.bat closes immediately · Issue #734 · FTBTeam/FTB-App
November 9, 2022 - The server files are not working for me. I'm using the installer provided, which fails to install some files every time I run it. Sometimes there will be 60 files failed sometimes there will be like 500. This is the message I get on the installer: Downloaded 1208 successful, 66 failed, 0 incomplete.
Author   FTBTeam
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GitHub
github.com › FTBTeam › FTB-Server-Installer › issues › 13
[Bug]: FTB Evolution - Failed to download file: All mirrors failed · Issue #13 · FTBTeam/FTB-Server-Installer
April 16, 2025 - Log Files Log from running with -verbose: ftb-server-installer.log Describe the issue Installer errors out while trying to download the server files. Steps to reproduce Run the installer. Additional info Error occurs on friend's datacent...
Author   FTBTeam
Find elsewhere
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GitHub
github.com › FTBTeam › FTB-Modpack-Issues › issues › 5601
Having problem installing server for FTB Unstable 1.21 · Issue #5601 · FTBTeam/FTB-Modpack-Issues
August 5, 2024 - Modpack Other... Modpack version 1.0.1 Has the pack been modified No Log Files latest.log Describe the bug Hello, I'm having trouble installing a server to play with my friend, the start.bat seems to get stuck on Config at C:\Users\quent...
Author   FTBTeam
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GitHub
github.com › FTBTeam › FTB-Server-Installer › issues › 41
[Bug]: Will not let me add permissions · Issue #41 · FTBTeam/FTB-Server-Installer
January 30, 2026 - Log Files personal-mc-server@mc-server:/DATA/AppData/crafty/servers/stoneblock3$ ./serverinstall_100_100096 panic: open ftb-server-installer.log: permission denied goroutine 1 [running]: main.main() /home/runner/work/FTB-Server-Installer...
Author   FTBTeam
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GitHub
github.com › FTBTeam › FTB-Server-Installer › issues
Issues · FTBTeam/FTB-Server-Installer
FTBTeam / FTB-Server-Installer Public · Notifications · You must be signed in to change notification settings · Fork 4 · Star 14 · Search Issues · is:issue state:open · is:issue state:open Search · LabelsMilestonesNew issue · Open · Closed · Status: Open.
Author   FTBTeam
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Reddit
reddit.com › r/feedthebeast › setting server up with new ftb app
r/feedthebeast on Reddit: Setting Server Up With New FTB App
January 4, 2021 -

SOLVED - SEE COMMENTS FOR SOLUTION

I'm trying to set up a server to play FTB Academy with my friends but it's not working at all. I can't find any tutorial with this new interface.

I downloaded the modpack from the app both in singleplayer and server versions.

I executed the .exe for the server in a folder named "FTB_AcademyServer". It added new files and then I ran "start.bat" and agreed to the EULA. It then created a "eula.txt" file with the line "eula=true". Then nothing. So I tried running the "forge-1.12.2-14.23.5.2847-universal.jar" which did nothing and then the "minecraft_server.1.12.2.jar" which did start the server.

Now, I can join my own server (I also did the port forwarding stuff) but my friends can't AND it doesn't seem to launch the modpack properly because it's listed in my Minecraft interface as "Vanilla Server". I'm assuming my friends can't join for that reason? I should add that my gf is among the people trying to join and she's on the same router as me and she still can't.

Top answer
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Found the solution myself lol If anyone needs helps, here it goes. Don't use the new FTB App from Overwolf. Instead, download the Curse Forge app from Overwolf and select minecraft and then the modpack you want to use (don't click install yet). Then click " versions " and select the most up-to-date Server Pack . In my case, The latest FTB_Academy didn't have a server pack but it still worked. I suggest saving the .zip to somewhere easily accessible since you'll need it to launch your server everytime. Then install the latest version of your modpack (the singleplayer version). Go to your .zip with the Server Pack and unzip. Open FTBInstall.bat and let it do its thing. It should close by itself once completed. Now open settings.bat in Notepad++ (or equivalent, just not the normal Notepad) and change the value after the "=" in "set MAX_RAM=" to the amount of RAM you want to give your server. I set it to "set MAX_RAM=12G" since I have 32Gb of RAM but more than 5-6Gb worked when I tested it with 3 players (just remember, the more players, the more RAM you'll need). Save and exit. Open ServerStart.bat and wait until a line says "You need to agree to the EULA to continue. Press any key to exit.". Do that and open the newly created eula.txt file and read the EULA on the website provided and then change the line from "eula=false" to "eula=true". Run ServerStart.bat again. When it's done (this depends on your modpack from what I gathered), you should have a file called server.properties where you can edit (guess what?) server properties! For now, simply close the ServerStart.bat and open server.properties with Notepad++. Search for "server-port=25565" (only change this value if you run multiple servers) and then do port forwarding to that port in your router. Open ServerStart.bat again and once it's completed this time, you'll have a fully working server (or should!). You can connect to your own server in minecraft using the ip adress localhost:25565 and go to https://whatismyipaddress.com/ find the adress your friends should use (if it doesn't work, they should add :25565 at the end). If you have an error relating to you not having JAVA 8, here's the download for Windows 64bit https://www.java.com/en/download/
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GitHub
github.com › FTBTeam › FTB-Modpack-Issues › issues › 5188
Server installer failed | Error downloading 404 Not Found · Issue #5188 · FTBTeam/FTB-Modpack-Issues
May 4, 2024 - FTB Presents Direwolf20 1.20 · 1.12.1 · https://pastebin.com/5Sq9N24L · Server installer can't download mcp_config 404 not found : "Error downloading https://maven.neoforged.net/releases/de/oceanlabs/mcp/mcp_config/1.20.1-20230612.114412/mcp_config-1.20.1-20230612.114412.zip: server returned 404 Not Found" Download server installer for 1.10,1.11, 1.12, 1.12.1 (tried these versions, all not working) start exe in terminal ·
Author   FTBTeam
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GitHub
github.com › FTBTeam › FTB-App › issues › 36
Server file download problems · Issue #36 · FTBTeam/FTB- ...
April 3, 2020 - It is very weird that it downloads an exe instead of a zip for the server files. It should totally be a zip that you just extract to wherever you want, having an exe is just weird and I don't understand it. ... It installs all the files to the folder the exe is in, instead of letting you choose where it goes.
Author   FTBTeam
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Feed The Beast Wiki
ftb.fandom.com › wiki › Troubleshooting
Troubleshooting - Official Feed The Beast Wiki
March 18, 2026 - Step by step instructions on how to update your particular system are beyond the scope of this document but you can start at java.com. Please note, if your system supports it (which most modern systems should), you should be using 64-bit Java. The FTB App bundles its own Java to ensure that there are no external requirements beyond the app to run Minecraft.
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Feed The Beast
docs.feed-the-beast.com › create your own server
Create your own server for any FTB Modpack - FTB Docs
If for any reason the server installer stopped working. You will want to create an issue on our Github which can be found here. ... This is a question we see pop up occasionally. The reason we do it this is way is that we can hot fix modpacks without having to ship out a new version. Say a file is missing from a version, we can just patch this in and the FTB App and the server installer with automatically know to use this new file.
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GitHub
github.com › FTBTeam › FTB-Modpack-Issues › issues › 4167
FTB Resurrection Server Installer for Linux Fails · Issue #4167 · FTBTeam/FTB-Modpack-Issues
November 4, 2023 - FTB Resurrectionstate: ConfirmedAn issue has been confirmed.An issue has been confirmed. ... The "serverinstall_12_119" binary does not download all files necessary for the server to operate. It says 4 files failed to download, all due to the error unsupported protocol scheme "". In the log file I stop when it shows that files were missed, I tried continuing the installation anyway but obviously the server then doesn't start.
Author   FTBTeam
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CubeCoders Support
discourse.cubecoders.com › technical support
FTB Modpack Cannot Install - Technical Support - CubeCoders Support
April 13, 2025 - Installing a modpack from FTB will not run because the install scripts expects the -force flag and that is unable to be set (best I can tell. A very detailed documentation of the error was opened by someone else on FTB Github: [Bug]: Install ...
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GitHub
github.com › FTBTeam › FTB-App › issues › 276
Server installer problem · Issue #276 · FTBTeam/FTB-App
September 16, 2020 - Unable to download: Connection reset javax.net.ssl.SSLException: Connection reset at sun.security.ssl.Alert.createSSLException(Alert.java:127) at sun.security.ssl.TransportContext.fatal(TransportContext.java:320) at sun.security.ssl.TransportContext.fatal(TransportContext.java:263) at sun.security.ssl.TransportContext.fatal(TransportContext.java:258) at sun.security.ssl.SSLTransport.decode(SSLTransport.java:137) at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1151) at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1062) at sun.security.ssl.SSLSocketImpl.start
Author   FTBTeam