firewall - Can't connect to port 25 on Google Compute instance (incoming SMTP) -

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i running postfix on google compute instance. listening on 0.0.0.0:25, , have opened port 25 on firewall, cannot connect outside. have reviewed this , this, not resolve issue. don't see in google compute documentation explain this.

the port open on firewall:

% gcutil --project=xxx getfirewall smtp +---------------+-------------------------------+ | name          | smtp                          | | description   | incoming smtp allowed.        | | creation-time | 2014-06-08t13:29:16.052-07:00 | | network       | default                       | | source-ips    | 0.0.0.0/0                     | | source-tags   |                               | | target-tags   |                               | | allowed       | tcp: 25                       | +---------------+-------------------------------+

from outside, can connect port 80 (which open)...

% telnet 108.xxx.xxx.xxx 80 trying 108.xxx.xxx.xxx... connected 108.xxx.xxx.xxx. escape character '^]'. / <!doctype html> <html ...> ... </html>connection closed foreign host.

...but not port 25:

% telnet 108.xxx.xxx.xxx 25 trying 108.xxx.xxx.xxx... telnet: connect address 108.xxx.xxx.xxx: operation timed out telnet: unable connect remote host

postfix listening on interfaces:

% gcutil --project=xxx ssh --zone=us-central1-a xxx sudo netstat -lpn -a inet ... active internet connections (only servers) proto recv-q send-q local address           foreign address         state       pid/program name ... tcp        0      0 0.0.0.0:25              0.0.0.0:*               listen      10794/master ...

i can "external" address...

% gcutil --project=xxx ssh --zone=us-central1-a xxx /sbin/ifconfig eth0 ... eth0      link encap:ethernet  hwaddr 42:01:0a:xx:xx:xx           inet addr:10.xxx.xxx.xxx  bcast:10.xxx.xxx.xxx  mask:255.255.255.255           broadcast running multicast  mtu:1460  metric:1           rx packets:46397953 errors:0 dropped:0 overruns:0 frame:2           tx packets:34953374 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000           rx bytes:5031906871 (4.6 gib)  tx bytes:49375287245 (45.9 gib)

...and telnet port 25 on box:

% gcutil --project=xxx ssh --zone=us-central1-a xxx telnet 10.xxx.xxx.xxx 25 ... trying 10.xxx.xxx.xxx... connected 10.xxx.xxx.xxx. escape character '^]'. 220 xxx esmtp postfix (debian/gnu) ehlo localhost 250-xxx 250-pipelining 250-size 10240000 250-vrfy 250-etrn 250-starttls 250-enhancedstatuscodes 250-8bitmime 250 dsn quit 221 2.0.0 bye connection closed foreign host.

any assistance appreciated.

take @ link blocked traffic says google blocks or restricts traffic through of following ports/protocols between internet , virtual machines on specified ports.

hope helps.

mary


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