Have you also made sure the box is listening on the ports in question?


Do this command

netstat -an | egrep '0.0.0.0:25|0.0.0.0:80|0.0.0.0:110|0.0.0.0:143'


You should get this in return if the services are running correctly.

tcp        0      0 0.0.0.0:110             0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:143             0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN



On 9/25/2019 8:49 AM, Eric Broch wrote:

I'd do a tailored tcpdump on the non-working interface while you tried to connect to see if packets are even getting to the host.

On 9/25/2019 4:28 AM, ChandranManikandan wrote:
Hi Tony,

These ip's are pinging and hosting the same server with configure multiple network.
These are working earlier well but suddenly is not working this domain reliancehrconsulting.com
i have stopped iptables also but no luck to respond the 143 and 25 ports and port 80 for this domain only.


On Wed, Sep 25, 2019 at 5:56 PM Tony White <t...@ycs.com.au> wrote:
Hi,

pan-asia.in is 49.128.39.115

reliancehrconsulting.com 49.128.39.123


best wishes
   Tony White

On 25/9/19 7:03 pm, ChandranManikandan wrote:

> Hi Eric,
>
> The working domain is pan-asia.in <http://pan-asia.in> and command is telnet domain.com <http://domain.com> 143 and
> telnet domain.com <http://domain.com> 25.
> Both the domains are fqdn
> Working domain pan-asia.in <http://pan-asia.in>
> non working domain reliancehrconsulting.com <http://reliancehrconsulting.com>
>
>
> On Wed, Sep 25, 2019 at 4:12 PM Eric Broch <ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>> wrote:
>
>     What commands are you using to telnet to the working and non-working domains, the fqdn? If you are using the fqdn has
>     the domain expired?
>
>     On 9/25/2019 12:44 AM, ChandranManikandan wrote:
>>     Hi Friends,
>>
>>     I have running centos 6.7 with 64 bit with multiple domains using qmailtoaster.
>>     all the domains configured web and email with letsencrypt certificate.
>>     One domain is not working suddenly web and email.
>>     I have tried to ping and able to get the ip address result.
>>     and also tried using telnet 143 and 25 port is not connecting, but the same ports are connected for other domain
>>     which was running the same machine.
>>     I have tried iptables stop but no luck.
>>     could anyone assist me to troubleshoot.
>>     Advance Appreciate your help
>>
>>     --
>>     */Regards,
>>     Manikandan.C
>>     /*
>
>
>
> --
> */Regards,
> Manikandan.C
> /*


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--
Regards,
Manikandan.C
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