Joining online-mode servers is no longer possible

[BigPanda97]

Describe the bug Joining online servers (Mojang Login) is not possible. (Connection Lost: java.io.EOFException)

Desktop (please complete the following information):

• OS: Windows 10
• Version: Latest, but seems to affect about the last 3 versions of AMC.

Additional context java.io.IOException: Server returned HTTP response code: 403 for URL: https://sessionserver.mojang.com/session/minecraft/join at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1997) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1589) at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224) at net.defekt.mc.chatclient.protocol.MojangAPI.makeJSONRequest(MojangAPI.java:162) at net.defekt.mc.chatclient.protocol.ClientPacketListener.packetReceived(ClientPacketListener.java:247) at net.defekt.mc.chatclient.protocol.MinecraftClient$1.run(MinecraftClient.java:378) at java.base/java.lang.Thread.run(Thread.java:833) java.io.EOFException at java.base/java.io.DataInputStream.readByte(DataInputStream.java:273) at net.defekt.mc.chatclient.protocol.io.VarInputStream.readVarInt(VarInputStream.java:77) at net.defekt.mc.chatclient.protocol.MinecraftClient$1.run(MinecraftClient.java:327) at java.base/java.lang.Thread.run(Thread.java:833) java.lang.InterruptedException: sleep interrupted at java.base/java.lang.Thread.sleep(Native Method) at net.defekt.mc.chatclient.ui.Main$89$3.run(Main.java:4109) at java.base/java.lang.Thread.run(Thread.java:833) java.lang.InterruptedException: sleep interrupted at java.base/java.lang.Thread.sleep(Native Method) at net.defekt.mc.chatclient.protocol.MinecraftClient$2.run(MinecraftClient.java:406) at java.base/java.lang.Thread.run(Thread.java:833)

[Defective4]

Are you sure you are using valid credentials? Also keep in mind that Microsoft auth is not supported at the moment, you can only login with Mojang account.

[BigPanda97]

Are you sure you are using valid credentials?

Yes, it worked a few days before on AMC with no problems on the older version. But I can re-check it tomorrow using the normal Minecraft client to be sure the login works fine.

Also keep in mind that Microsoft auth is not supported at the moment, you can only login with Mojang account.

Yes, it's a Mojang account.

[BigPanda97]

Okay, so it looks like Mojang is now blocking ALL accounts which are not migrated to a Microsoft account. So, Microsoft login must be implemented in order to use the AMC again...