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POGoogle Compute Engine will not allow incoming smtp connections
 

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  1. POGoogle Compute Engine will not allow incoming smtp connections
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    <p>I have a virtual machine (CentOS) running on Google's Compute Engine and everything seems pretty straight forward, have read all the documentation I can find, but this one thing is hanging me up. I know outbound SMTP connections are blocked by the GCE, but incoming should be no problem from what I've read. However, I've configured the server correctly (I think) and added the firewall for SMTP through gcutil, but still no dice:</p> <pre><code>gcutil addfirewall smtp --description="Incoming smtp allowed." --allowed="tcp:smtp" </code></pre> <p>This adds the rule to allow SMTP connections.</p> <pre><code>gcutil listfirewalls +------------------------+---------------------------------------+---------+------------+-------------+-------------+ | name | description | network | source-ips | source-tags | target-tags | +------------------------+---------------------------------------+---------+------------+-------------+-------------+ | default-allow-internal | Internal traffic from default allowed | default | 10.0.0.0/8 | | | | default-ssh | SSH allowed from anywhere | default | 0.0.0.0/0 | | | | http2 | Incoming http allowed. | default | 0.0.0.0/0 | | | | pop3 | Incoming pop3 allowed. | default | 0.0.0.0/0 | | | | smtp | Incoming smtp allowed. | default | 0.0.0.0/0 | | | +------------------------+---------------------------------------+---------+------------+-------------+-------------+ </code></pre> <p>SMTP rule is listed. Other ports work fine, I can get into ports 80, 22, and 110. But when trying to get into port 25:</p> <pre><code>telnet nextcore.com 25 Trying 173.255.112.1... </code></pre> <p>It will not connect.</p> <p>Connecting to localhost port 25 on the virtual machine works just fine:</p> <pre><code>telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 nextcore.localdomain ESMTP Postfix </code></pre> <p>What am I missing?</p>
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