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Don't cache failed DNS lookups in the desktop client #1684

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Merged
jcschaff merged 1 commit into from
May 7, 2026
+8 −0
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Don't cache failed DNS lookups in the desktop client #1684

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8 changes: 8 additions & 0 deletions vcell-client/src/main/java/cbit/vcell/client/VCellClientMain.java
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,14 @@ private VCellClientMain() {
* @param args an array of command-line arguments
*/
public static void main(java.lang.String[] args) {
// Recover gracefully when DNS lookups fail transiently (e.g. laptop wake from sleep).
// Java's default 10s negative-result cache combined with our continuous polling loop
// wedges the client at "connecting…" until restart, because the polling interval is
// shorter than the cache TTL so the cached failure never expires. A short positive
// TTL still gives reasonable cache locality without holding stale entries indefinitely.
java.security.Security.setProperty("networkaddress.cache.ttl", "30");
java.security.Security.setProperty("networkaddress.cache.negative.ttl", "0");

System.out.println("starting with arguments " + Arrays.asList(args));
int exitCode = 1;
try {
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