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Hello Alex,</div>
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Syslog-ng can be compiled with or without IPv6 support. As a first step please verify if it was compiled that way.</div>
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<br>
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If you start Syslog-ng with the "--version" option it will print a little debug information about itself. <span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 12pt;">Among other options there w</span><span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 12pt;">ill be
a line: "Enable-IPv6"</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 12pt;"><br>
</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 12pt;"> (If it was compiled with "Enable-IPv6: on", please copy the entire output here. It will help with the later investigation.)</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 12pt;">Best regards,</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica, sans-serif; font-size: 12pt;">Laci</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> syslog-ng <syslog-ng-bounces@lists.balabit.hu> on behalf of Alexandre Santos <alexandre.rosas.santos@gmail.com><br>
<b>Sent:</b> Friday, August 28, 2020 12:35<br>
<b>To:</b> Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu><br>
<b>Subject:</b> [syslog-ng] No remote logging with hostname which has address is IPv6</font>
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<span style="color:#9C6500; font-weight:bold">CAUTION:</span> This email originated from outside of the organization. Do not follow guidance, click links, or open attachments unless you recognize the sender and know the content is safe.</div>
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<div>Hi,</div>
<div><br>
</div>
<div>I have configuration, which is sending log messages to a remote hostname (dns6server). The particularity of this remote server is that it is resolved to an IPv6 address.</div>
<div><br>
</div>
<div>ping works fine:</div>
<div><span style="font-family:monospace">root@localhost:~# ping dns6server -c 3<br>
PING dns6server(2620:38:4::8:4000:238) 56 data bytes<br>
64 bytes from 2620:38:4::8:4000:238: icmp_seq=1 ttl=63 time=0.354 ms<br>
64 bytes from 2620:38:4::8:4000:238: icmp_seq=2 ttl=63 time=0.264 ms<br>
64 bytes from 2620:38:4::8:4000:238: icmp_seq=3 ttl=63 time=0.310 ms</span></div>
<div><br>
</div>
<div>But syslog-ng seems not to be able to resolve the ipv6 address:</div>
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<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt"><span style="font-family:monospace"><font size="2"><span>Aug 27 20:58:37 localhost systemd[1]: mgmt-syslog-ng.service: Succeeded.<span></span></span></font></span></p>
<span style="font-family:monospace"><font size="2"></font></span>
<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt"><span style="font-family:monospace"><font size="2"><span>Aug 27 20:58:37 localhost systemd[1]: Stopped External Logger Daemon.<span></span></span></font></span></p>
<span style="font-family:monospace"><font size="2"></font></span>
<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt"><span style="font-family:monospace"><font size="2"><span>Aug 27 20:58:37 localhost systemd[1]: Starting External Logger Daemon...<span></span></span></font></span></p>
<span style="font-family:monospace"><font size="2"></font></span>
<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt"><span style="font-family:monospace"><font size="2"><span>Aug 27 20:58:37 localhost ip[32709]: [2020-08-27T20:58:37.841389] WARNING: With use-dns(no), dns-cache() will be forced to 'no' too!;<span></span></span></font></span></p>
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<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt"><span style="font-family:monospace"><font size="2"><span>Aug 27 20:58:46 localhost ip[32709]: [2020-08-27T20:58:46.854714] Error resolving hostname; host='dns6server'<span></span></span></font></span></p>
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<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt"><span style="font-family:monospace"><font size="2"><span>Aug 27 20:58:46 localhost ip[32709]: [2020-08-27T20:58:46.854758] Initiating connection failed, reconnecting; time_reopen='60'<span></span></span></font></span></p>
<span style="font-family:monospace"><font size="2"></font></span>
<p class="x_MsoNormal" style="margin:0cm 0cm 0.0001pt; font-size:11pt"><span style="font-family:monospace"><span style="font-size:8pt"><font size="2">Aug 27 20:58:46 localhost systemd[1]: Started External Logger Daemon.</font></span></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif"><br>
</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif">Any Ideas?<br>
</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif"><br>
</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif">I am sending the configuration and debug log in attachment.<br>
</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif"><br>
</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif">Thanks in Advance,</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif">Alex<br>
</span></font></span></p>
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<span style="font-size:8pt; font-family:Consolas"><font size="2"><span style="font-family:arial,sans-serif"></span></font><span></span></span></p>
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