Index: src/java/org/apache/ivy/util/ConfigurationUtils.java
===================================================================
--- src/java/org/apache/ivy/util/ConfigurationUtils.java	(revision 691563)
+++ src/java/org/apache/ivy/util/ConfigurationUtils.java	Wed Sep 03 19:08:42 PDT 2008
@@ -20,6 +20,7 @@
 import java.util.Arrays;
 import java.util.LinkedHashSet;
 import java.util.Set;
+import java.util.Iterator;
 
 import org.apache.ivy.core.module.descriptor.Configuration;
 import org.apache.ivy.core.module.descriptor.ModuleDescriptor;
@@ -61,6 +62,7 @@
         }
 
         Set result = new LinkedHashSet();
+        Set excluded = new LinkedHashSet();
         for (int i = 0; i < confs.length; i++) {
             if ("*".equals(confs[i])) {
                 result.addAll(Arrays.asList(md.getConfigurationsNames()));
@@ -78,10 +80,15 @@
                         result.add(all[j].getName());
                     }
                 }
+            } else if (confs[i].startsWith("!")) {
+                excluded.add(confs[i].substring( 1 ));
             } else {
                 result.add(confs[i]);
             }
         }
+        for (Iterator iter = excluded.iterator(); iter.hasNext();) {
+            result.remove(iter.next());
+        }
 
         return (String[]) result.toArray(new String[result.size()]);
     }
Index: test/java/org/apache/ivy/ant/IvyResolveTest.java
===================================================================
--- test/java/org/apache/ivy/ant/IvyResolveTest.java	(revision 691563)
+++ test/java/org/apache/ivy/ant/IvyResolveTest.java	Wed Sep 03 19:08:24 PDT 2008
@@ -388,6 +388,17 @@
         assertNotNull(project.getReference("ivy.resolved.configurations.ref.testWithResolveId"));
     }
 
+    public void testExcludedConf() throws Exception {
+        resolve.setFile(new File("test/java/org/apache/ivy/ant/ivy-multiconf.xml"));
+        resolve.setConf("*,!default");
+        resolve.execute();
+
+        assertTrue(getIvyFileInCache(
+            ModuleRevisionId.newInstance("org1", "mod1.1", "2.0")).exists());
+        assertFalse(getIvyFileInCache(
+            ModuleRevisionId.newInstance("org1", "mod1.2", "2.0")).exists());
+    }
+
     public void testResolveWithAbsoluteFile() {
         // IVY-396
         File ivyFile = new File("test/java/org/apache/ivy/ant/ivy-simple.xml");