Please provide
- Operating system: Windows 11 Enterprise 25H2
- SonarQube for VS Code plugin version: 5.6.0
- Programming language you’re coding in: Mix
- Is connected mode used: Yes
- SonarQube Cloud, SonarQube Server, or SonarQube Community Build? (if one of the latter two, which version?): 2026.3
And a thorough description of the problem / question:
I see in VSCode output for extension that it is trying to download from Internet and it fails if you sit behind corporate proxy during lookup since it does not pick up any configured proxy configuration in VSCode it seems:
(Seen when starting VSCode)
2026-07-28 18:25:09.000 [info] [Info - 18:25:07.472] [sonarlint : SonarLint Server RPC sequential executor] Started embedded server on port 64120
2026-07-28 18:25:11.742 [info] [Info - 18:25:08.147] [sonarlint : sonarlint-plugin-download-0] Downloading omnisharp-net472 plugin version 1.39.15 from https://binaries.sonarsource.com/OmniSharp-Roslyn/1.39.15/omnisharp-net472.tar.gz
2026-07-28 18:25:11.925 [info] [Info - 18:25:08.147] [sonarlint : sonarlint-plugin-download-1] Downloading cpp plugin version 6.83.0.100813 from https://binaries.sonarsource.com/CommercialDistribution/sonar-cfamily-plugin/sonar-cfamily-plugin-6.83.0.100813.jar
2026-07-28 18:25:12.009 [info] [Info - 18:25:08.147] [sonarlint : sonarlint-plugin-download-2] Downloading csharp plugin version 10.29.0.143774 from https://binaries.sonarsource.com/Distribution/sonar-csharp-plugin/sonar-csharp-plugin-10.29.0.143774.jar
2026-07-28 18:25:12.061 [info] [Info - 18:25:08.148] [sonarlint : sonarlint-plugin-download-3] Downloading omnisharp-net6 plugin version 1.39.15 from https://binaries.sonarsource.com/OmniSharp-Roslyn/1.39.15/omnisharp-net6.0.tar.gz
2026-07-28 18:25:12.103 [info] [Info - 18:25:08.148] [sonarlint : sonarlint-plugin-download-4] Downloading omnisharp-mono plugin version 1.39.15 from https://binaries.sonarsource.com/OmniSharp-Roslyn/1.39.15/omnisharp-mono.tar.gz
2026-07-28 18:25:12.122 [info] [Error - 18:25:08.278] [sonarlint : sonarlint-plugin-download-4] Failed to download artifact with key omnisharp-mono
2026-07-28 18:25:12.126 [info] [Error - 18:25:08.279] [sonarlint : sonarlint-plugin-download-4] java.util.concurrent.CompletionException: java.net.UnknownHostException: binaries.sonarsource.com
at java.base/java.util.concurrent.CompletableFuture.reportJoin(CompletableFuture.java:413)
at java.base/java.util.concurrent.CompletableFuture.join(CompletableFuture.java:2118)
at org.sonarsource.sonarlint.core.http.ApacheHttpClientAdapter.waitFor(ApacheHttpClientAdapter.java:115)
at org.sonarsource.sonarlint.core.http.ApacheHttpClientAdapter.get(ApacheHttpClientAdapter.java:92)
at org.sonarsource.sonarlint.core.plugin.source.binaries.BinariesArtifactSource.downloadArtifact(BinariesArtifactSource.java:274)
at org.sonarsource.sonarlint.core.plugin.source.binaries.BinariesArtifactSource.downloadAndVerify(BinariesArtifactSource.java:240)
at org.sonarsource.sonarlint.core.plugin.source.binaries.BinariesArtifactSource.downloadAndCache(BinariesArtifactSource.java:173)
at org.sonarsource.sonarlint.core.plugin.source.binaries.BinariesArtifactSource.downloadAndFireEvent(BinariesArtifactSource.java:181)
at org.sonarsource.sonarlint.core.plugin.source.binaries.BinariesArtifactSource.lambda$scheduleDownload$7(BinariesArtifactSource.java:122)
at org.sonarsource.sonarlint.core.plugin.source.UniqueTaskExecutor.lambda$scheduleIfAbsent$0(UniqueTaskExecutor.java:43)
at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.net.UnknownHostException: binaries.sonarsource.com
at java.base/java.net.InetAddress$CachedLookup.get(InetAddress.java:988)
at java.base/java.net.InetAddress$NameServiceAddresses.get(InetAddress.java:1191)
at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1818)
at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1688)
at org.apache.hc.client5.http.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:61)
at org.apache.hc.client5.http.DnsResolver.resolve(DnsResolver.java:77)
at org.apache.hc.client5.http.impl.nio.MultihomeIOSessionRequester.connect(MultihomeIOSessionRequester.java:113)
at org.apache.hc.client5.http.impl.nio.DefaultAsyncClientConnectionOperator.connect(DefaultAsyncClientConnectionOperator.java:147)
at org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager.connect(PoolingAsyncClientConnectionManager.java:499)
at org.apache.hc.client5.http.impl.async.InternalHttpAsyncExecRuntime.connectEndpoint(InternalHttpAsyncExecRuntime.java:230)
at org.apache.hc.client5.http.impl.async.AsyncConnectExec.doProceedToNextHop(AsyncConnectExec.java:222)
at org.apache.hc.client5.http.impl.async.AsyncConnectExec.proceedToNextHop(AsyncConnectExec.java:197)
at org.apache.hc.client5.http.impl.async.AsyncConnectExec.access$000(AsyncConnectExec.java:92)
at org.apache.hc.client5.http.impl.async.AsyncConnectExec$1.completed(AsyncConnectExec.java:164)
at org.apache.hc.client5.http.impl.async.AsyncConnectExec$1.completed(AsyncConnectExec.java:153)
at org.apache.hc.client5.http.impl.async.InternalHttpAsyncExecRuntime$1.completed(InternalHttpAsyncExecRuntime.java:132)
at org.apache.hc.client5.http.impl.async.InternalHttpAsyncExecRuntime$1.completed(InternalHttpAsyncExecRuntime.java:124)
at org.apache.hc.core5.concurrent.BasicFuture.completed(BasicFuture.java:148)
at org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager$3$1.leaseCompleted(PoolingAsyncClientConnectionManager.java:372)
at org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager$3$1.completed(PoolingAsyncClientConnectionManager.java:354)
at org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager$3$1.completed(PoolingAsyncClientConnectionManager.java:300)
at org.apache.hc.core5.concurrent.BasicFuture.completed(BasicFuture.java:148)
at org.apache.hc.core5.pool.StrictConnPool.fireCallbacks(StrictConnPool.java:396)
at org.apache.hc.core5.pool.StrictConnPool.lease(StrictConnPool.java:214)
at org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager$3.<init>(PoolingAsyncClientConnectionManager.java:297)
at org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager.lease(PoolingAsyncClientConnectionManager.java:292)
at org.apache.hc.client5.http.impl.async.InternalHttpAsyncExecRuntime.acquireEndpoint(InternalHttpAsyncExecRuntime.java:119)
at org.apache.hc.client5.http.impl.async.AsyncConnectExec.execute(AsyncConnectExec.java:152)
at org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
at org.apache.hc.client5.http.impl.async.AsyncProtocolExec.internalExecute(AsyncProtocolExec.java:206)
at org.apache.hc.client5.http.impl.async.AsyncProtocolExec.execute(AsyncProtocolExec.java:171)
at org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
at org.apache.hc.client5.http.impl.async.AsyncHttpRequestRetryExec.internalExecute(AsyncHttpRequestRetryExec.java:114)
at org.apache.hc.client5.http.impl.async.AsyncHttpRequestRetryExec.execute(AsyncHttpRequestRetryExec.java:219)
at org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
at org.apache.hc.client5.http.impl.async.ContentCompressionAsyncExec.execute(ContentCompressionAsyncExec.java:140)
at org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
at org.apache.hc.client5.http.impl.async.AsyncRedirectExec.internalExecute(AsyncRedirectExec.java:112)
at org.apache.hc.client5.http.impl.async.AsyncRedirectExec.execute(AsyncRedirectExec.java:293)
at org.apache.hc.client5.http.impl.async.AsyncExecChainElement.execute(AsyncExecChainElement.java:54)
at org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient.executeImmediate(InternalAbstractHttpAsyncClient.java:389)
at org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient.lambda$doExecute$0(InternalAbstractHttpAsyncClient.java:245)
at org.apache.hc.core5.http.nio.support.BasicRequestProducer.sendRequest(BasicRequestProducer.java:93)
at org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient.doExecute(InternalAbstractHttpAsyncClient.java:209)
at org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient.execute(CloseableHttpAsyncClient.java:96)
at org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient.execute(CloseableHttpAsyncClient.java:106)
at org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient.execute(CloseableHttpAsyncClient.java:123)
at org.sonarsource.sonarlint.core.http.ApacheHttpClientAdapter$CompletableFutureWrappingFuture.<init>(ApacheHttpClientAdapter.java:229)
at org.sonarsource.sonarlint.core.http.ApacheHttpClientAdapter.executeAsync(ApacheHttpClientAdapter.java:277)
at org.sonarsource.sonarlint.core.http.ApacheHttpClientAdapter.getAsync(ApacheHttpClientAdapter.java:97)
... 11 more
VSCode setting “sonarlint.ls.vmargs” is set with standard Java proxy setting but is not picked up.