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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>
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<item>
            <title>[CSHARP-3107] calling fromconnectionString throws null DNSClient exception - </title>
                <link>https://jira.mongodb.org/browse/CSHARP-3107</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;it seems something has changed since version 2.9.0 that throws the exception whenever you try to initiate the DB from the connection string. previous version all works fine.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;at DnsClient.NameServer.ResolveNameServers (System.Boolean skipIPv6SiteLocal, System.Boolean fallbackToGooglePublicDns) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0005e&amp;#93;&lt;/span&gt; in &amp;lt;93b57b4b99c64a96a2c065ea9ae1fc1f&amp;gt;:0 &lt;br/&gt;
 at DnsClient.LookupClient..ctor () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00000&amp;#93;&lt;/span&gt; in &amp;lt;93b57b4b99c64a96a2c065ea9ae1fc1f&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Misc.DnsClientWrapper..ctor () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00006&amp;#93;&lt;/span&gt; in &amp;lt;69a19ce1f0ff410ca77cc0cfdf31b04c&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.DnsMonitorFactory..ctor (MongoDB.Driver.Core.Events.IEventSubscriber eventSubscriber, MongoDB.Driver.Core.Misc.IDnsResolver dnsResolver) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00017&amp;#93;&lt;/span&gt; in &amp;lt;69a19ce1f0ff410ca77cc0cfdf31b04c&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.MultiServerCluster..ctor (MongoDB.Driver.Core.Configuration.ClusterSettings settings, MongoDB.Driver.Core.Servers.IClusterableServerFactory serverFactory, MongoDB.Driver.Core.Events.IEventSubscriber eventSubscriber, MongoDB.Driver.Core.Clusters.IDnsMonitorFactory dnsMonitorFactory) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0005d&amp;#93;&lt;/span&gt; in &amp;lt;69a19ce1f0ff410ca77cc0cfdf31b04c&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.ClusterFactory.CreateMultiServerCluster (MongoDB.Driver.Core.Configuration.ClusterSettings settings) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00000&amp;#93;&lt;/span&gt; in &amp;lt;69a19ce1f0ff410ca77cc0cfdf31b04c&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.ClusterFactory.CreateCluster () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x000bf&amp;#93;&lt;/span&gt; in &amp;lt;69a19ce1f0ff410ca77cc0cfdf31b04c&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Configuration.ClusterBuilder.BuildCluster () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00006&amp;#93;&lt;/span&gt; in &amp;lt;69a19ce1f0ff410ca77cc0cfdf31b04c&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.ClusterRegistry.CreateCluster (MongoDB.Driver.ClusterKey clusterKey) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x000be&amp;#93;&lt;/span&gt; in &amp;lt;3b162f88ef324ea39a81e2d6bf362821&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.ClusterRegistry.GetOrCreateCluster (MongoDB.Driver.ClusterKey clusterKey) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00021&amp;#93;&lt;/span&gt; in &amp;lt;3b162f88ef324ea39a81e2d6bf362821&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.MongoClient..ctor (MongoDB.Driver.MongoClientSettings settings) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0002d&amp;#93;&lt;/span&gt; in &amp;lt;3b162f88ef324ea39a81e2d6bf362821&amp;gt;:0 &lt;br/&gt;
 at SensoDrive.Client.Infrastructure.Database.CosmoMongoDb.InitializeCosmoDBAsync () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0002f&amp;#93;&lt;/span&gt;&lt;/p&gt;</description>
                <environment>visual stuido 2019, csharp, xamarin forms - azure cosmos DB</environment>
        <key id="1356634">CSHARP-3107</key>
            <summary>calling fromconnectionString throws null DNSClient exception - </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="dmitry.lukyanov@mongodb.com">Dmitry Lukyanov</assignee>
                                    <reporter username="sasan.pasha@gmail.com">Sasan Pasha</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 May 2020 01:44:51 +0000</created>
                <updated>Thu, 21 May 2020 23:30:20 +0000</updated>
                            <resolved>Thu, 21 May 2020 15:31:22 +0000</resolved>
                                    <version>2.9.0</version>
                                                    <component>Connectivity</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3103436" author="JIRAUSER1252531" created="Thu, 21 May 2020 23:29:37 +0000"  >&lt;p&gt;can you please confirm you used Visual studio 2019, Xamarin Forms cross platform ( android) and trying to call the library? the issue shows up on the android device not being able to read the DNS - older version works fine.&#160;&lt;/p&gt;

&lt;p&gt;the fact that older versions of the library work and this version doesn&apos;t points to the fact that something in this library is changed and there is nothing to do with azure - can you please check before closing the ticket?&lt;/p&gt;</comment>
                            <comment id="3102347" author="dmitry.lukyanov" created="Thu, 21 May 2020 15:20:22 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sasan.pasha%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;sasan.pasha@gmail.com&quot;&gt;sasan.pasha@gmail.com&lt;/a&gt;,&lt;br/&gt;
Thanks for your report. I&apos;ve tried to reproduce this issue with the mongodb atlas server, but with no luck. So it looks like this error is cosmosdb specific. If so, it&apos;s better to ask it here: &lt;a href=&quot;https://gotcosmos.com/community&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gotcosmos.com/community&lt;/a&gt;. If you have more details, please add them and we will be happy to investigate them.&lt;/p&gt;</comment>
                            <comment id="3098709" author="JIRAUSER1252531" created="Thu, 21 May 2020 03:05:47 +0000"  >&lt;p&gt;the connection string is&#160;&quot;&lt;font color=&quot;#00875a&quot;&gt;&lt;b&gt;mongodb://&lt;span class=&quot;error&quot;&gt;&amp;#91;username&amp;#93;&lt;/span&gt;:&lt;span class=&quot;error&quot;&gt;&amp;#91;password&amp;#93;&lt;/span&gt;@&lt;span class=&quot;error&quot;&gt;&amp;#91;AppName&amp;#93;&lt;/span&gt;.mongo.cosmos.azure.com:10255/?ssl=true&amp;amp;replicaSet=globaldb&amp;amp;maxIdleTimeMS=120000&amp;amp;appName=@&lt;span class=&quot;error&quot;&gt;&amp;#91;AppName&amp;#93;&lt;/span&gt;@&lt;/b&gt;&lt;/font&gt;&quot;&lt;/p&gt;

&lt;p&gt;the full exception is&#160;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;&lt;font color=&quot;#de350b&quot;&gt;Could not find file &quot;/etc/resolv.conf&quot;&lt;/font&gt;&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;&lt;font color=&quot;#de350b&quot;&gt;DnsClient {System.NullReferenceException:&lt;/font&gt;&lt;/b&gt; Object reference not set to an instance of an object.&lt;br/&gt;
 at DnsClient.NameServer.QueryNetworkInterfaces () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00047&amp;#93;&lt;/span&gt; in &amp;lt;62d2e9033ef84b01abb5bb4b3b2561e7&amp;gt;:0 &lt;br/&gt;
 at DnsClient.NameServer.ResolveNameServers (System.Boolean skipIPv6SiteLocal, System.Boolean fallbackToGooglePublicDns) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0005e&amp;#93;&lt;/span&gt; in &amp;lt;62d2e9033ef84b01abb5bb4b3b2561e7&amp;gt;:0 }&lt;/p&gt;

&lt;p&gt;at DnsClient.NameServer.ResolveNameServers (System.Boolean skipIPv6SiteLocal, System.Boolean fallbackToGooglePublicDns) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x000df&amp;#93;&lt;/span&gt; in &amp;lt;62d2e9033ef84b01abb5bb4b3b2561e7&amp;gt;:0 &lt;br/&gt;
 at DnsClient.LookupClient..ctor (DnsClient.LookupClientOptions options, DnsClient.DnsMessageHandler udpHandler, DnsClient.DnsMessageHandler tcpHandler) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x000bd&amp;#93;&lt;/span&gt; in &amp;lt;62d2e9033ef84b01abb5bb4b3b2561e7&amp;gt;:0 &lt;br/&gt;
 at DnsClient.LookupClient..ctor (DnsClient.LookupClientOptions options) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00000&amp;#93;&lt;/span&gt; in &amp;lt;62d2e9033ef84b01abb5bb4b3b2561e7&amp;gt;:0 &lt;br/&gt;
 at DnsClient.LookupClient..ctor () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00006&amp;#93;&lt;/span&gt; in &amp;lt;62d2e9033ef84b01abb5bb4b3b2561e7&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Misc.DnsClientWrapper..ctor () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00006&amp;#93;&lt;/span&gt; in &amp;lt;7564e277fa414dd0a424d279e88f55b9&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.DnsMonitorFactory..ctor (MongoDB.Driver.Core.Events.IEventSubscriber eventSubscriber, MongoDB.Driver.Core.Misc.IDnsResolver dnsResolver) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00017&amp;#93;&lt;/span&gt; in &amp;lt;7564e277fa414dd0a424d279e88f55b9&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.MultiServerCluster..ctor (MongoDB.Driver.Core.Configuration.ClusterSettings settings, MongoDB.Driver.Core.Servers.IClusterableServerFactory serverFactory, MongoDB.Driver.Core.Events.IEventSubscriber eventSubscriber, MongoDB.Driver.Core.Clusters.IDnsMonitorFactory dnsMonitorFactory) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0005d&amp;#93;&lt;/span&gt; in &amp;lt;7564e277fa414dd0a424d279e88f55b9&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.ClusterFactory.CreateMultiServerCluster (MongoDB.Driver.Core.Configuration.ClusterSettings settings) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00000&amp;#93;&lt;/span&gt; in &amp;lt;7564e277fa414dd0a424d279e88f55b9&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Clusters.ClusterFactory.CreateCluster () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x000d3&amp;#93;&lt;/span&gt; in &amp;lt;7564e277fa414dd0a424d279e88f55b9&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.Core.Configuration.ClusterBuilder.BuildCluster () &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00006&amp;#93;&lt;/span&gt; in &amp;lt;7564e277fa414dd0a424d279e88f55b9&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.ClusterRegistry.CreateCluster (MongoDB.Driver.ClusterKey clusterKey) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x000be&amp;#93;&lt;/span&gt; in &amp;lt;951c7635de1243b1bc8bc6a47a9933d5&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.ClusterRegistry.GetOrCreateCluster (MongoDB.Driver.ClusterKey clusterKey) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x00021&amp;#93;&lt;/span&gt; in &amp;lt;951c7635de1243b1bc8bc6a47a9933d5&amp;gt;:0 &lt;br/&gt;
 at MongoDB.Driver.MongoClient..ctor (MongoDB.Driver.MongoClientSettings settings) &lt;span class=&quot;error&quot;&gt;&amp;#91;0x0002d&amp;#93;&lt;/span&gt; in &amp;lt;951c7635de1243b1bc8bc6a47a9933d5&amp;gt;:0&lt;/p&gt;</comment>
                            <comment id="3096984" author="dmitry.lukyanov" created="Wed, 20 May 2020 12:08:29 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sasan.pasha%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;sasan.pasha@gmail.com&quot;&gt;sasan.pasha@gmail.com&lt;/a&gt;,&lt;br/&gt;
can you please provide your connection string (for security reasons you can replace real credentials and server address with placeholder values). Also, it will be great if you provide the whole error message.&lt;/p&gt;</comment>
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