Hi,
I have a little server mail on Proxmox 3.1, is a CentOS 6 OpenVZ template.
It work well, but this morning a client said that suddenly it not connect to mail server....
I checked out and seems that ADSL public IP of customer is unreachable from mail server and viceversa.
Now I checked all plausible problem and I don't how to figure out the problem: the 2 IP respond correctly on internet from another ADSL, there is no firewall blocking o blacklisting the IP, the provider said that routing it's ok.
Still I cannot ping host from each other.
Please can you help me to understand what happened?
I have a little server mail on Proxmox 3.1, is a CentOS 6 OpenVZ template.
It work well, but this morning a client said that suddenly it not connect to mail server....
I checked out and seems that ADSL public IP of customer is unreachable from mail server and viceversa.
Now I checked all plausible problem and I don't how to figure out the problem: the 2 IP respond correctly on internet from another ADSL, there is no firewall blocking o blacklisting the IP, the provider said that routing it's ok.
Still I cannot ping host from each other.
Please can you help me to understand what happened?