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<div class="moz-cite-prefix">On 2/16/22 17:06, William Cole via
Nut-upsuser wrote:<br>
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<blockquote type="cite"
cite="mid:CAGJ8fTGAxQBEn3La4=rqeRYBhWvMBKGw=R_whNa5npbYP_GQYw@mail.gmail.com">
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<div>Hello All,</div>
<div><br>
</div>
<div>I ran telnet on both machines:</div>
<div> First from the server [235] to the client [236]</div>
<div> Then from the client [236] to the server [235]</div>
<div><br>
</div>
<div>The result in both cases:</div>
<div> Trying 192.168.1.xxx</div>
<div> telnet: Unable to connect to remote host: Connection
refused.</div>
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</blockquote>
<p>I am 90% sure that you have a firewall that blocks TCP
connections. Many modern linux distros come with a default
firewall which blocks all incoming connections or allow a very
limited subset of ports, like ssh ( port 22 ) and web ( port 80
and/or 443 ).<br>
</p>
<p>You can do a quick test by running as root ( or via sudo if
needed ) one of the following two commands on the server machine:</p>
<p> iptables -I INPUT -p tcp --dport 3493 -j ACCEPT <== this
will enable access to port TCP/3493</p>
<p>or</p>
<p> iptables -F <=== this should disable the firewall
completely. Note that depending on the distribution that you use,
a more civilized way to ( temporary ) disable the firewall exists,
for instance in recent Debian/Ubuntu you'd run <span
style="font-family: "verdana" , sans-serif;"><i>ufw
disable</i> while on CentOS/RHEL you'd use <i>systemctl stop
firewalld ( </i>with the obvious <i>ufw enable</i> resp <i>systemctl
start firewalld</i> to enable the firewall back )</span></p>
<p>If I am right, once you've allowed the incoming connection,
repeating the telnet command should succeed. In this case you must
modify the firewall and add a permanent rule to allow the
connection.<br>
</p>
<p><br>
</p>
<p>wolfy<br>
<span style="font-family: "verdana" , sans-serif;"><i></i></span></p>
<p><span style="font-family: "verdana" , sans-serif;"><br>
</span></p>
<p><br>
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