Getting firewall *tcp_in blocked*

CSF firewall related CSF - CSF Firewall info | Centmin Mod Community and CSF Firewall - Centmin Mod - Menu based Nginx installer for CentOS servers

more info might be helpful

1. What version of Centmin Mod ? .07 stable or .08 beta ? If .08 beta when was it installed and when was last time you updated the .08 beta code (there's constant updates to the code).
2. What's your VPS/Server hardware specifications ? Xen/KVM/OpenVZ ? cpu type ? memory available ? disk space ? OS and version ? i.e. CentOS 6.6 or 7.1 ?
3. Who's your web host ?
4. Your ISP ip address static/dynamic ?
5. What were you doing connection wise to your server leading up to the blockage ?

 

If you're on dynamic ip, you may need additional steps CSF Firewall as per Getting Started Guide step 4

 

Can you access SSH via DigitalOcean VNC Console ? If you can, check if you ips are blocked using csf -g grep command

Code:

csf -g YOURIPADDRESS

commands you can see for csf via

Code:

csf -h

whitelist your ISP range of ips if you know the range

Code:

csf -a IPADDRESSORRANGE

remove temp and permanent blocks from csf

Code:

csf -tr IPADDRESS
csf -dr IPADDRESS

also check CSF /var/log/lfd.log for clues

Code:

tail -50 /var/log/lfd.log

If you're on dynamic ip, you may need additional steps CSF Firewall as per Getting Started Guide step 4

 

yeah you'd need to investigate further with the logs and csf/lfd logs

another log is /var/log/messages you can grep it for your ips

Code:

grep IPADDRESS /var/log/messages

 

that's normal CSF lfd blocks failed SSH log in attempts after so many attempts.. unless those ips are you ip address then you don't need to worry about that