Failed to download mojang_1.21.jar

I'm getting this error when trying to start the server after updating to paper 1.21 (#37)
Oracle Free Tier

container@pterodactyl~ java -version
openjdk version "21.0.3" 2024-04-16 LTS
OpenJDK Runtime Environment Temurin-21.0.3+9 (build 21.0.3+9-LTS)
OpenJDK 64-Bit Server VM Temurin-21.0.3+9 (build 21.0.3+9-LTS, mixed mode, sharing)
container@pterodactyl~ java -Xms8G -Xmx20G -XX:MaxRAMPercentage=95.0 -Dterminal.jline=false -Dterminal.ansi=true -jar paper.jar
Downloading mojang_1.21.jar

Ubuntu 20.04 Oracle Free Tier. Pterodactyl panel. Deleted old files from 1.20 server and added new paper.jar (build #37) to update server to 1.21 but it gets stuck here.

Failed to download mojang_1.21.jar
java.net.UnknownHostException: piston-data.mojang.com
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:567)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327)
at java.base/java.net.Socket.connect(Socket.java:751)
at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:304)
at java.base/sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:181)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:183)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:531)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:636)
at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:377)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:193)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1237)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1123)
at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:179)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1675)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1599)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:223)
at java.base/java.net.URL.openStream(URL.java:1325)
at io.papermc.paperclip.DownloadContext.download(DownloadContext.java:55)
at io.papermc.paperclip.Paperclip.setupClasspath(Paperclip.java:63)
at io.papermc.paperclip.Paperclip.main(Paperclip.java:28)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at io.papermc.paperclip.Main.main(Main.java:26)
container@pterodactyl~ Server marked as offline...
[Pterodactyl Daemon]: ---------- Detected server process in a crashed state! ----------
[Pterodactyl Daemon]: Exit code: 1
[Pterodactyl Daemon]: Out of memory: false
[Pterodactyl Daemon]: Aborting automatic restart, last crash occurred less than 60 seconds ago.
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