> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.ggservers.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# `Unable to login: java.io.IOException with a 503` Error Type

![](https://storage.crisp.chat/users/helpdesk/website/4c80d853f5d12c00/89da4f76-df6c-41d2-915d-804052_18k2x76.png)

This guide will help you solve the `Unable to login: java.io.IOException with a 503` error type.

||| Note that we have a guide [here](https://help.ggservers.com/en-us/article/troubleshooting-minecraft-server-errors-8z6t65/) for troubleshooting Minecraft errors which is explaining about this error too!  
---

# ❓ What Is this Error ❓

If you have received a `java.io.IOException` with a `503` error, this means the **Minecraft session servers are down**.  
---

# 🔩 How to Fix 🔩

**Sometimes this is a glitch that can be fixed by:**

* Closing your game.

* Logging out of your launcher.

* Restarting the server.

* Restarting your launcher, logging back into Mojang, and trying to connect again.  
---

If this doesn't work, the session servers are down, and you’ll be unable to join any server with **online mode** enabled.

Most servers have **online mode** enabled for security. If you desperately need to get on your server, you can enable the offline mode.

||| [Here](https://help.ggservers.com/en-us/article/how-to-enable-the-offline-mode-in-your-server-1l5bcz6/) is our guide explaining the offline mode and how to enable it.  
---

| If you find any issues with this error type, we ask you to contact us via live chat or the ticket system [here](https://ggservers.com/billing/submitticket.php).  
---

# ❕ Useful Links ❕

- [How to Use the JSON Validator (JSON Error Type)](https://help.ggservers.com/en-us/article/how-to-use-the-json-validator-json-error-type-12ugkgp/)  
- [Connection refused: no further information](https://help.ggservers.com/en-us/article/connection-refused-no-further-information-anka7e/)  
- [Connection Timed Out - An Existing Connection Was Forcibly Closed by the Remote Host.](https://help.ggservers.com/en-us/article/connection-timed-out-an-existing-connection-was-forcibly-closed-by-the-remote-host-582awl/)