Index: modules/ldap/util_ldap_cache.c
===================================================================
--- modules/ldap/util_ldap_cache.c	(Revision 928898)
+++ modules/ldap/util_ldap_cache.c	(Arbeitskopie)
@@ -420,6 +420,7 @@
     apr_status_t result;
     apr_size_t size;
 
+    if (st->cache_bytes > 0) {
     if (st->cache_file) {
         /* Remove any existing shm segment with this name. */
         apr_shm_remove(st->cache_file, st->pool);
@@ -442,6 +443,7 @@
     if (result != APR_SUCCESS) {
         return result;
     }
+    }
 
 #endif
 
Index: modules/ldap/util_ldap_cache_mgr.c
===================================================================
--- modules/ldap/util_ldap_cache_mgr.c	(Revision 928898)
+++ modules/ldap/util_ldap_cache_mgr.c	(Arbeitskopie)
@@ -335,7 +335,7 @@
 
 #if APR_HAS_SHARED_MEMORY
     if (!st->cache_rmm) {
-        return NULL;
+        cache = (util_ald_cache_t *)calloc(sizeof(util_ald_cache_t), 1);
     }
     else {
         apr_rmm_off_t block = apr_rmm_calloc(st->cache_rmm, sizeof(util_ald_cache_t));
Index: modules/ldap/util_ldap.c
===================================================================
--- modules/ldap/util_ldap.c	(Revision 928898)
+++ modules/ldap/util_ldap.c	(Arbeitskopie)
@@ -2710,7 +2710,7 @@
 #if APR_HAS_SHARED_MEMORY
         /* If the cache file already exists then delete it.  Otherwise we are
          * going to run into problems creating the shared memory. */
-        if (st->cache_file) {
+        if (st->cache_file && st->cache_bytes > 0) {
             char *lck_file = apr_pstrcat(ptemp, st->cache_file, ".lck",
                                          NULL);
             apr_file_remove(lck_file, ptemp);
@@ -2723,7 +2723,7 @@
     /* initializing cache if shared memory size is not zero and we already
      * don't have shm address
      */
-    if (!st->cache_shm && st->cache_bytes > 0) {
+    if (!st->cache_shm && st->cache_bytes >= 0) {
 #endif
         result = util_ldap_cache_init(p, st);
         if (result != APR_SUCCESS) {