WebStorm AI Assistant Claude 4: Unknown server error has occurred.

I am now experiencing the same problem with the same model and Free AI Assistant. Sometimes, the AI starts answering before the error message above appears.

My IDE settings:

WebStorm 2025.1.3
Build #WS-251.26927.40, built on June 20, 2025
Source revision: ce471299dab0d
Subscription is active until December 7, 2025.
For non-commercial use only.
Runtime version: 21.0.7+9-b895.130 aarch64 (JCEF 122.1.9)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.lwawt.macosx.LWCToolkit
macOS 15.5
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 2048M
Cores: 8
Metal Rendering is ON
Registry:
 ide.experimental.ui=true
Non-Bundled Plugins:
 org.jetbrains.completion.full.line (251.26927.999.1)
 bundled-webstorm-help (251.26927.40)
 org.jetbrains.junie (251.204.122)
 com.intellij.ml.llm (251.26094.80.22)
 org.jetbrains.plugins.gitlab (251.26927.54-IU)
 org.jetbrains.plugins.github (251.26927.54-IU)
 com.github.biomejs.intellijbiome (1.9.0)
 

I have the same issue with Goland intermittently. 

Hello,

On July 25, we experienced a brief outage on the Anthropic side that might have caused this issue.
You can find more information here: https://status.jetbrains.ai/history

If you are still encountering the problem, please create a support ticket (https://www.jetbrains.com/support/) and attach the debug logs or upload logs (https://uploads.jetbrains.com/) and provide the Upload ID in the thread so I can investigate it further.

You can collect debug logs by following these steps:

• Navigate to Help | Diagnostic Tools | Debug Log Settings
• Add the following lines:
  com.intellij.ml.llm
com.intellij.util.io.HttpRequests
com.intellij.util.proxy.CommonProxy
• Navigate to Help | Edit Custom VM Options
• Add the following line:
  -Djdk.httpclient.HttpClient.log=ALL
• Restart IDE
• Reproduce the issue and collect logs via Help | Collect Logs and Diagnostic Data.

Thank you!