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solr/server/etc/security.properties

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# command-line security properties file
+#
+# By default, when enabling security manager, DNS lookups are cached indefinitely,
+# as protection against DNS spoofing.  We set this back to the default (non-security-manager)
+# value of 30 seconds, to prevent surprising behavior (e.g. nodes in cloud environments without
+# static IP addresses). Users concerned about DNS spoofing should instead follow best practices:
+# populating solr.allowUrls, enabling TLS, etc.
+networkaddress.cache.ttl=30