[IntelliJ] Uncaught Exception Error retrieving vulnerability data from GitHub Security Advisory API java.net.ConnectException

IntelliJ build version: 2025.3.1.1 IU-253.29346.240
OS: Mac OS X
JDK: JetBrains s.r.o. 21.0.9
Plugin version: 3.97.2-2025.3
Additional Info: None
Parent component:

com.intellij.openapi.wm.impl.IdeRootPane[,0,0,1920x1080,layout=com.intellij.openapi.wm.impl.IdeRootPane$CustomHeaderRootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=449,maximumSize=,minimumSize=,preferredSize=]

Error message:

IdeaLoggingEvent[message=Error retrieving vulnerability data from GitHub Security Advisory API, throwable=java.net.ConnectException
	at <REDACTED: user-file-path>(HttpClientImpl.java:955)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.retrieveVulnerabilityData(CVECheckService.java:312)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.fetchCves(CVECheckService.java:241)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.getCveUpgradeIssues(CVECheckService.java:200)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.CVECheckService.batchGetCVEIssues(CVECheckService.java:171)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.service.JavaUpgradeIssuesDetectionService.getCVEIssues(JavaUpgradeIssuesDetectionService.java:385)
	at com.microsoft.azure.toolkit.intellij.appmod.javaupgrade.serv

Start by reading CVECheckService.retrieveVulnerabilityData at line 312 and follow its callers through fetchCves, getCveUpgradeIssues, and batchGetCVEIssues. Reproduce the GitHub Security Advisory API connection failure if possible, then determine and verify the appropriate handling for the exception in the Java upgrade issue detection flow.