Can you share error logs (if any)?

Open:

Railway Project → Service → Deployments → View Logs

and send:

The last 50 lines before the crash.

The exit code (if shown).

Caused by: java.net.ConnectException: Connection refused

at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]

at java.base/sun.nio.ch.Net.pollConnectNow(Unknown Source) ~[na:na]

at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(Unknown Source) ~[na:na]

at java.base/sun.nio.ch.NioSocketImpl.connect(Unknown Source) ~[na:na]

at java.base/java.net.SocksSocketImpl.connect(Unknown Source) ~[na:na]

at java.base/java.net.Socket.connect(Unknown Source) ~[na:na]

at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:144) ~[mysql-connector-j-9.3.0.jar!/:9.3.0]

at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:53) ~[mysql-connector-j-9.3.0.jar!/:9.3.0]

this error happened with me many times and the reason because :

Database Connection Issues: A temporary network hiccup or wrong connection string could cause the first database call to fail, crashing the service.

Logic Error on First Run: A null reference or unexpected data could cause an exception right at the start of the ExecuteAsync loop.

Missing Environment Variable: A service might be trying to read a configuration value (like a Firebase or OpenAI key) that isn't set on Railway, causing an immediate crash

so u can check logs and it will detect which reason of them and u can solve the error quickly