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

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*/Regards,
Manikandan.C
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