diff --git a/management/univention-directory-manager-modules/modules/univention/admin/uldap.py b/management/univention-directory-manager-modules/modules/univention/admin/uldap.py
index e736bee..d264d63 100644
--- a/management/univention-directory-manager-modules/modules/univention/admin/uldap.py
+++ b/management/univention-directory-manager-modules/modules/univention/admin/uldap.py
@@ -363,6 +363,8 @@ def search(self, filter='(objectClass=*)', base='', scope='sub', attr=[], unique
 			raise univention.admin.uexceptions.ldapSizelimitExceeded(_err2str(msg))
 		except ldap.FILTER_ERROR as msg:
 			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), filter))
+		except ldap.INVALID_DN_SYNTAX as msg:
+			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), base), original_exception=msg)
 		except ldap.LDAPError as msg:
 			raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
 
@@ -379,6 +381,8 @@ def searchDn(self, filter='(objectClass=*)', base='', scope='sub', unique=0, req
 			raise univention.admin.uexceptions.ldapSizelimitExceeded(_err2str(msg))
 		except ldap.FILTER_ERROR as msg:
 			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), filter))
+		except ldap.INVALID_DN_SYNTAX as msg:
+			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), base), original_exception=msg)
 		except ldap.LDAPError as msg:
 			raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
 
@@ -403,6 +407,8 @@ def add(self, dn, al, exceptions=False):
 		except ldap.INSUFFICIENT_ACCESS as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'add dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.permissionDenied
+		except ldap.INVALID_DN_SYNTAX as msg:
+			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), dn), original_exception=msg)
 		except ldap.LDAPError as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'add dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
@@ -424,6 +430,8 @@ def modify(self, dn, changes, exceptions=False, ignore_license=0):
 		except ldap.INSUFFICIENT_ACCESS as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'mod dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.permissionDenied
+		except ldap.INVALID_DN_SYNTAX as msg:
+			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), dn), original_exception=msg)
 		except ldap.LDAPError as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'mod dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
@@ -445,6 +453,8 @@ def rename(self, dn, newdn, move_childs=0, ignore_license=False):
 		except ldap.INSUFFICIENT_ACCESS as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'ren dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.permissionDenied
+		except ldap.INVALID_DN_SYNTAX as msg:
+			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), dn), original_exception=msg)
 		except ldap.LDAPError as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'ren dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)
@@ -465,6 +475,8 @@ def delete(self, dn, exceptions=False):
 		except ldap.INSUFFICIENT_ACCESS as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'del dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.permissionDenied
+		except ldap.INVALID_DN_SYNTAX as msg:
+			raise univention.admin.uexceptions.ldapError('%s: %s' % (_err2str(msg), dn), original_exception=msg)
 		except ldap.LDAPError as msg:
 			univention.debug.debug(univention.debug.LDAP, univention.debug.ALL, 'del dn=%s err=%s' % (dn, msg))
 			raise univention.admin.uexceptions.ldapError(_err2str(msg), original_exception=msg)