diff --git a/source/java/org/alfresco/repo/site/SiteServiceImpl.java b/source/java/org/alfresco/repo/site/SiteServiceImpl.java
index ad0e25ca42..31aaf020de 100644
--- a/source/java/org/alfresco/repo/site/SiteServiceImpl.java
+++ b/source/java/org/alfresco/repo/site/SiteServiceImpl.java
@@ -2262,10 +2262,11 @@ public class SiteServiceImpl extends AbstractLifecycleBean implements SiteServic
         List<String> groups = getPermissionGroups(shortName, authorityName);
         for (String group : groups)
         {
-            int index = group.indexOf(shortName) + shortName.length();
+            String shortNamePattern = '_' + shortName + '_';
+            int index = group.lastIndexOf(shortNamePattern) + (shortNamePattern).length();
             if (index != -1)
             {
-                result.add(group.substring(index + 1));
+                result.add(group.substring(index));
             }
         }
         return result;
diff --git a/source/test-java/org/alfresco/repo/invitation/AbstractInvitationServiceImplTest.java b/source/test-java/org/alfresco/repo/invitation/AbstractInvitationServiceImplTest.java
index 425f0025ba..c313557ca1 100644
--- a/source/test-java/org/alfresco/repo/invitation/AbstractInvitationServiceImplTest.java
+++ b/source/test-java/org/alfresco/repo/invitation/AbstractInvitationServiceImplTest.java
@@ -40,6 +40,7 @@ import javax.mail.internet.MimeMessage;
 import org.alfresco.model.ContentModel;
 import org.alfresco.repo.action.executer.MailActionExecuter;
 import org.alfresco.repo.management.subsystems.ApplicationContextFactory;
+import org.alfresco.repo.processor.TemplateServiceImpl;
 import org.alfresco.repo.security.authentication.AuthenticationComponent;
 import org.alfresco.repo.security.authentication.AuthenticationUtil;
 import org.alfresco.repo.site.SiteModel;
@@ -51,9 +52,7 @@ import org.alfresco.service.cmr.invitation.InvitationService;
 import org.alfresco.service.cmr.invitation.ModeratedInvitation;
 import org.alfresco.service.cmr.invitation.NominatedInvitation;
 import org.alfresco.service.cmr.repository.TemplateService;
-import org.alfresco.service.cmr.repository.NodeRef;
 import org.alfresco.service.cmr.security.PersonService;
-import org.alfresco.service.cmr.security.PersonService.PersonInfo;
 import org.alfresco.service.cmr.site.SiteInfo;
 import org.alfresco.service.cmr.site.SiteService;
 import org.alfresco.service.cmr.site.SiteVisibility;
@@ -62,7 +61,6 @@ import org.alfresco.util.PropertyMap;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.springframework.util.ReflectionUtils;
-import org.alfresco.repo.processor.TemplateServiceImpl;
 
 /**
  * Unit tests of Invitation Service
@@ -661,6 +659,39 @@ public abstract class AbstractInvitationServiceImplTest extends BaseAlfrescoSpri
         }
     }
     
+    /**
+     * MNT-15614 Site with name "IT" cannot be managed properly
+     * 
+     * @throws Exception
+     */
+    public void test_MNT15614() throws Exception
+    {
+        String[] siteNames = {"it", "site", "GROUP"};
+        String inviteeUserName = USER_ONE;
+        Invitation.ResourceType resourceType = Invitation.ResourceType.WEB_SITE;
+
+        String inviteeRole = SiteModel.SITE_COLLABORATOR;
+        String acceptUrl = "froob";
+        String rejectUrl = "marshmallow";
+        
+        this.authenticationComponent.setCurrentUser(AuthenticationUtil.getAdminUserName());
+        
+        for (String siteName : siteNames)
+        {
+            SiteInfo siteInfoRed = siteService.getSite(siteName);
+            if (siteInfoRed == null)
+            {
+                siteService.createSite("InviteSitePreset", siteName, "InviteSiteTitle",
+                        "InviteSiteDescription", SiteVisibility.MODERATED);
+            }
+
+            // Invite user
+            NominatedInvitation nominatedInvitation = invitationService.inviteNominated(
+                    inviteeUserName, resourceType, siteName, inviteeRole, acceptUrl, rejectUrl);
+            assertNotNull("nominated invitation is null", nominatedInvitation);
+        }
+    }
+    
     /**
      * Test nominated user - new user with whitespace in name. Related to
      * ETHREEOH-3030.
diff --git a/source/test-java/org/alfresco/repo/site/SiteServiceImplTest.java b/source/test-java/org/alfresco/repo/site/SiteServiceImplTest.java
index 7a601fafdf..af8fe61fb9 100644
--- a/source/test-java/org/alfresco/repo/site/SiteServiceImplTest.java
+++ b/source/test-java/org/alfresco/repo/site/SiteServiceImplTest.java
@@ -869,6 +869,33 @@ public class SiteServiceImplTest extends BaseAlfrescoSpringTest
         startNewTransaction();
     }
     
+    public void testMNT_15614() throws Exception
+    {
+        RetryingTransactionCallback<Object> work = new RetryingTransactionCallback<Object>()
+        {
+
+            @Override
+            public Object execute() throws Throwable
+            {
+                String[] siteNames = { "it", "site", "GROUP" };
+
+                authenticationComponent.setCurrentUser(AuthenticationUtil.getAdminUserName());
+
+                for (String siteName : siteNames)
+                {
+                    siteService.createSite(siteName, siteName, siteName, siteName, SiteVisibility.PUBLIC);
+                    assertEquals( SiteModel.SITE_MANAGER, siteService.getMembersRole(siteName, AuthenticationUtil.getAdminUserName()));
+                    siteService.deleteSite(siteName);
+                }
+
+                return null;
+            }
+        };
+        endTransaction();
+        transactionService.getRetryingTransactionHelper().doInTransaction(work);
+        startNewTransaction();
+    }
+    
     /**
      * Test listSite case sensitivity
      */