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<h3>
Matt Selsky pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/9e72bcc7fb2956e99f36138700676ac4d7427824">9e72bcc7</a></strong>
<div>
<span>by Paul Theodoropoulos</span>
<i>at 2018-10-17T03:39:57Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs/debug.txt edits
</pre>
</li>
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<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#ec43c435b6d22a78802010dbca8a2ea79cd30e1e">
docs/debug.txt
</a>
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<h4>Changes:</h4>
<li id="ec43c435b6d22a78802010dbca8a2ea79cd30e1e">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/9e72bcc7fb2956e99f36138700676ac4d7427824#ec43c435b6d22a78802010dbca8a2ea79cd30e1e"><strong>docs/debug.txt</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -49,7 +49,7 @@ are sent to the optional +protostats+ monitor file, as described on the</td>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">link:decode.html[Event Messages and Status Words] page. These and other</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">error messages are sent to the system log, as described on the</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">link:msyslog.html[+ntpd+ System Log Messages] page. In real emergencies</span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext">the daemon will sen<span class="idiff left right">t</span> a terminal error message to the system log and then</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">the daemon will sen<span class="idiff left right">d</span> a terminal error message to the system log and then</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">cease operation.</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext">The next most common problem is incorrect DNS names. Check that each DNS</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -63,17 +63,17 @@ problems with the network or firewall configuration.</td>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext">Unless using the +iburst+ option, the client normally takes a few</span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext">minutes to synchronize to a server. If the client time at startup</span>
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<pre style="margin: 0;">-<span id="LC66" class="line" lang="plaintext">happens to be more than 1000 s<span class="idiff left right">ec</span> distant from NTP time, the daemon exits</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">happens to be more than 1000 s distant from NTP time, the daemon exits</span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">with a message to the system log directing the operator to manually set</span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext">the time within 1000 s<span class="idiff left right">ec and restart. If the time is less than 1000 sec</span> but</span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext">more than 128 s<span class="idiff left right">ec</span> distant, a step correction occurs and the daemon</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext">the time within 1000 s<span class="idiff left right"> and restart. If the time is less than 1000 s</span> but</span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">more than 128 s distant, a step correction occurs and the daemon</span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext">restarts automatically.</span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="plaintext">When started for the first time and a frequency file <span class="idiff left right">is not present, the</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="plaintext"><span class="idiff left right">daemon enters a special mode in order to calibrate the frequency. This</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="plaintext"><span class="idiff left right">takes 900 sec during which the time is not disciplined. When calibratio</span>n</span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext"><span class="idiff left right">is complete, the daemon creates the frequency file and enters normal</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="plaintext">mode to amortize whatever residual offset remains.</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext">When started for the first time and a frequency file <span class="idiff left right">- usually ntp.drift -</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext"><span class="idiff left right">is not present, the daemon enters a special mode in order to calibrate the</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext"><span class="idiff left right">frequency. This takes 900 s during which the time is not disciplined. Whe</span>n</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext"><span class="idiff left right">calibration is complete, the daemon creates the frequency file and enters</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext"><span class="idiff left right">normal </span>mode to amortize whatever residual offset remains.</span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">The +ntpq+ commands +pe+, +as+ and +rv+ are normally sufficient to</span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext">verify correct operation and assess nominal performance. The</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="93" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -93,7 +93,7 @@ link:ntpq.html#rv[+rv assocID+] command, where +assocID+ is the</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">association ID, displays the link:ntpq.html#peer[peer variables]</span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext">billboard, including the link:decode.html#peer[peer status word]. Note</span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext">that, except for explicit calendar dates, times are in milliseconds and</span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">frequencies are in parts-per-million (<span class="idiff left right">PPM</span>).</span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">frequencies are in parts-per-million (<span class="idiff left right">ppm</span>).</span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="plaintext">A detailed explanation of the system, peer and clock variables in the</span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="plaintext">billboards is beyond the scope of this page; however, a comprehensive</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -139,8 +139,8 @@ link:ntpviz.html[ntpviz].</td>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="plaintext">== Large Frequency Errors ==</span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="plaintext">The frequency tolerance of computer clock oscillators varies widely,</span>
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="plaintext">sometimes above 500 <span class="idiff left right">PPM</span>. While the daemon can handle frequency errors up</span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="plaintext">to 500 <span class="idiff left right">PPM, or 43 seconds per day, values much above 100 PPM</span> reduce the</span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext">sometimes above 500 <span class="idiff left right">ppm</span>. While the daemon can handle frequency errors up</span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext">to 500 <span class="idiff left right">ppm, or 43 seconds per day, values much above 100 ppm</span> reduce the</span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext">headroom, especially at the lowest poll intervals. To determine the</span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">particular oscillator frequency, start +ntpd+ using the +noselect+</span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="plaintext">option with the +server+ configuration command.</span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="plaintext">Record the time of day and offset displayed by the +ntpq+</span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext">link:ntpq.html#peer[+peer+] command. Wait for an hour or so and record the</span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">time of day and offset. Calculate the frequency as the offset difference</span>
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="plaintext">divided by the time difference. If the frequency <span class="idiff left right">is much above 100 PPM</span>,</span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="plaintext">divided by the time difference. If the frequency <span class="idiff left right">offset is much above 100 ppm</span>,</span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="plaintext">the link:ntpfrob.html[{ntpfrob}] program might be useful to adjust the</span>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="plaintext">kernel clock frequency below that value. For systems that do not support</span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="plaintext">this program, this might be one using a command in the system startup</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -235,7 +235,10 @@ running.</td>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext">3.  Verify using +ping+ or other utility that packets actually do make</span>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="plaintext">the round trip between the client and server. Verify using +dig+,</span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="plaintext">+nslookup+ or other utility that the DNS server names do exist and</span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="plaintext">resolve to valid Internet addresses.</span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="plaintext">resolve to valid Internet addresses. Be aware that ICMP (ping) packets</span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="plaintext">may be firewalled or filtered anywhere in the path. Ping failure does not</span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="plaintext">explicitly mean that the client and server cannot exchange NTP's</span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="plaintext">UDP traffic.</span>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="plaintext">4.  Check that the remote NTP server is up and running. The usual</span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="plaintext">evidence that it is not is a +Connection refused+ message.</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -244,7 +247,7 @@ evidence that it is not is a +Connection refused+ message.</td>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="plaintext">packets sent counters are incrementing. If the sent counter does not</span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="plaintext">increment and the configuration file includes configured servers,</span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="plaintext">something may be wrong in the host network or interface configuration.</span>
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="plaintext">If th<span class="idiff left right">is</span> counter does increment, but the received counter does not</span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="plaintext">If th<span class="idiff left right">e sent</span> counter does increment, but the received counter does not</span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="plaintext">increment, something may be wrong in the network or the server NTP</span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="plaintext">daemon may not be running or the server itself may be down or not</span>
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<pre style="margin: 0;"> <span id="LC253" class="line" lang="plaintext">responding.</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -255,8 +258,9 @@ received packets are probably being discarded for some reason. If this</td>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="plaintext">is the case, the cause should be evident from the +flash+ variable as</span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="plaintext">discussed above and on the +ntpq+ page. It could be that the server has</span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="plaintext">disabled access for the client address, in which case the +refid+ field</span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="plaintext">in the +ntpq+ peers billboard will show a kiss code. See earlier on this</span>
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="plaintext">page for a list of kiss codes and their meaning.</span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="plaintext">in the +ntpq+ peers billboard will show a kiss code. See</span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="plaintext">link:decode.html#kiss[Kiss Codes] for a full list of the codes and their</span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="plaintext">meanings.</span>
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="plaintext">7.  If the +reach+ values in the peers billboard show the servers are</span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="plaintext">alive and responding, note the tattletale symbols at the left margin,</span>
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