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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[JAVA-510] connection refused connecting when mongod is bound to 127.0.0.1</title>
                <link>https://jira.mongodb.org/browse/JAVA-510</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;WAIT! Before you close this as a duplicate, I do not believe anyone has given the full details.&lt;/p&gt;

&lt;p&gt;The problem is you simply cannot connect to a mongod from java when it is bound to the 127.0.0.1 interface only.&lt;/p&gt;

&lt;p&gt;Step 1: configure mongod to 127.0.0.1 only&lt;br/&gt;
--------------------------&lt;br/&gt;
logpath=/var/log/mongo/mongod.log&lt;br/&gt;
logappend=true&lt;br/&gt;
fork = true&lt;br/&gt;
dbpath=/var/lib/mongo&lt;br/&gt;
replSet =sipxecs&lt;br/&gt;
port=27017&lt;br/&gt;
bind_ip=127.0.0.1&lt;br/&gt;
-------------------------&lt;/p&gt;

&lt;p&gt;Step 2: Compile and run this code&lt;br/&gt;
-----------------------------&lt;br/&gt;
import com.mongodb.MongoURI;&lt;br/&gt;
import com.mongodb.Mongo;&lt;br/&gt;
import com.mongodb.DB;&lt;br/&gt;
import com.mongodb.DBCollection;&lt;br/&gt;
import com.mongodb.BasicDBObject;&lt;br/&gt;
public class Test {&lt;br/&gt;
    public static void main(String[] args) throws Exception &lt;/p&gt;
{
	Mongo m = new Mongo(&quot;127.0.0.1&quot;, 27017);
	DB d = m.getDB(&quot;imdb&quot;);
	DBCollection col = d.getCollection(&quot;imdb&quot;);
	BasicDBObject o = new BasicDBObject();
	col.findOne(o);
    }
&lt;p&gt;}&lt;br/&gt;
--------------------------&lt;/p&gt;

&lt;p&gt;You will get the following error&lt;br/&gt;
----------------------------&lt;br/&gt;
Jan 25, 2012 4:44:21 PM com.mongodb.DBTCPConnector fetchMaxBsonObjectSize&lt;br/&gt;
WARNING: Exception determining maxBSON size using0&lt;br/&gt;
java.io.IOException: couldn&apos;t connect to &lt;span class=&quot;error&quot;&gt;&amp;#91;/127.0.0.1:27017&amp;#93;&lt;/span&gt; bc:java.net.ConnectException: Connection refused&lt;br/&gt;
	at com.mongodb.DBPort._open(DBPort.java:228)&lt;br/&gt;
	at com.mongodb.DBPort.go(DBPort.java:112)&lt;br/&gt;
	at com.mongodb.DBPort.go(DBPort.java:93)&lt;br/&gt;
	at com.mongodb.DBPort.findOne(DBPort.java:146)&lt;br/&gt;
	at com.mongodb.DBPort.runCommand(DBPort.java:157)&lt;br/&gt;
	at com.mongodb.DBTCPConnector.fetchMaxBsonObjectSize(DBTCPConnector.java:457)&lt;br/&gt;
	at com.mongodb.DBTCPConnector.checkMaster(DBTCPConnector.java:444)&lt;br/&gt;
	at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:209)&lt;br/&gt;
	at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:305)&lt;br/&gt;
	at com.mongodb.DBCollection.findOne(DBCollection.java:647)&lt;br/&gt;
	at com.mongodb.DBCollection.findOne(DBCollection.java:626)&lt;br/&gt;
	at Test.main(Test.java:14)&lt;br/&gt;
Jan 25, 2012 4:44:21 PM com.mongodb.DBPortPool gotError&lt;br/&gt;
WARNING: emptying DBPortPool to 127.0.0.1:27017 b/c of error&lt;br/&gt;
java.io.IOException: couldn&apos;t connect to &lt;span class=&quot;error&quot;&gt;&amp;#91;/127.0.0.1:27017&amp;#93;&lt;/span&gt; bc:java.net.ConnectException: Connection refused&lt;br/&gt;
	at com.mongodb.DBPort._open(DBPort.java:228)&lt;br/&gt;
	at com.mongodb.DBPort.go(DBPort.java:112)&lt;br/&gt;
	at com.mongodb.DBPort.call(DBPort.java:79)&lt;br/&gt;
	at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:218)&lt;br/&gt;
	at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:305)&lt;br/&gt;
	at com.mongodb.DBCollection.findOne(DBCollection.java:647)&lt;br/&gt;
	at com.mongodb.DBCollection.findOne(DBCollection.java:626)&lt;br/&gt;
	at Test.main(Test.java:14)&lt;br/&gt;
Exception in thread &quot;main&quot; com.mongodb.MongoException$Network: can&apos;t call something : /127.0.0.1:27017/imdb&lt;br/&gt;
	at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:227)&lt;br/&gt;
	at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:305)&lt;br/&gt;
	at com.mongodb.DBCollection.findOne(DBCollection.java:647)&lt;br/&gt;
	at com.mongodb.DBCollection.findOne(DBCollection.java:626)&lt;br/&gt;
	at Test.main(Test.java:14)&lt;br/&gt;
Caused by: java.io.IOException: couldn&apos;t connect to &lt;span class=&quot;error&quot;&gt;&amp;#91;/127.0.0.1:27017&amp;#93;&lt;/span&gt; bc:java.net.ConnectException: Connection refused&lt;br/&gt;
	at com.mongodb.DBPort._open(DBPort.java:228)&lt;br/&gt;
	at com.mongodb.DBPort.go(DBPort.java:112)&lt;br/&gt;
	at com.mongodb.DBPort.call(DBPort.java:79)&lt;br/&gt;
	at com.mongodb.DBTCPConnector.call(DBTCPConnector.java:218)&lt;/p&gt;
</description>
                <environment>Fedora 14 x86_64&lt;br/&gt;
Java Driver 2.7.0 and 2.7.2</environment>
        <key id="29160">JAVA-510</key>
            <summary>connection refused connecting when mongod is bound to 127.0.0.1</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="5">Cannot Reproduce</resolution>
                                        <assignee username="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="dhubler">Douglas Hubler</reporter>
                        <labels>
                            <label>driver</label>
                    </labels>
                <created>Wed, 25 Jan 2012 21:56:58 +0000</created>
                <updated>Wed, 19 Oct 2016 14:17:27 +0000</updated>
                            <resolved>Fri, 27 Jan 2012 13:16:43 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="82779" author="dhubler" created="Fri, 27 Jan 2012 13:07:16 +0000"  >&lt;p&gt;you can close this.&lt;/p&gt;

&lt;p&gt;I upgraded from mongo-server 2.0.0 (from fedora 14) to mongodb-server 2.0.2 (one i built) and now it works.  I&apos;m not sure if it&apos;s related, but might be.  I thought I tried this test many times.  Anyway, I verified mongo shell and java cannot connect when using IP from eth0 interface.    I didn&apos;t check &quot;localhost&quot; v.s. &quot;127.0.0.1&quot; but I can work with &quot;127.0.0.1&quot;.  &lt;/p&gt;

&lt;p&gt;Thanks Jeff!&lt;/p&gt;
</comment>
                            <comment id="82452" author="jeff.yemin" created="Thu, 26 Jan 2012 03:45:58 +0000"  >&lt;p&gt;I&apos;m able to run this without error.  Does the mongo shell work, or does it also complain?&lt;/p&gt;</comment>
                    </comments>
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