Firewall CSF issue

how did you mess up ? error messages ? specifics

so you were able to ping both servers respectively before ?

did you change SSHD ports anytime between the process for either or both servers ?

grep /var/log/messages for your server's IP addresses on both servers see if they are in fact blocked

see csf help file

Code:

csf -h
csf: v8.03 (generic)
csf(1)                                                                  csf(1)



NAME
       csf - ConfigServer & Security Firewall

SYNOPSIS
       csf [OPTIONS]

DESCRIPTION
       This manual documents the csf command line options for the ConfigServer
       & Security Firewall. See /etc/csf/csf.conf and /etc/csf/readme.txt  for
       more detailed information on how to use and configure this application.

OPTIONS
       -h,  --help
              Show this message

       -l,  --status
              List/Show the IPv4 iptables configuration

       -l6, --status6
              List/Show the IPv6 ip6tables configuration

       -s,  --start
              Start the firewall rules

       -f,  --stop
              Flush/Stop firewall rules (Note: lfd may restart csf)

       -r,  --restart
              Restart firewall rules (csf)

       -q,  --startq
              Quick restart (csf restarted by lfd)

       -sf, --startf
              Force CLI restart regardless of LFDSTART setting

       -ra, --restartall
              Restart firewall rules (csf) and then restart lfd  daemon.  Both
              csf and then lfd should be restarted after making any changes to
              the configuration files

       --lfd [stop|start|restart|status]
              Actions to take with the lfd daemon

       -a,  --add ip [comment]
              Allow an IP and add to /etc/csf/csf.allow

       -ar, --addrm ip
              Remove an IP from /etc/csf/csf.allow and delete rule

       -d,  --deny ip [comment]
              Deny an IP and add to /etc/csf/csf.deny

       -dr, --denyrm ip
              Unblock an IP and remove from /etc/csf/csf.deny

       -df, --denyf
              Remove and unblock all entries in /etc/csf/csf.deny

       -g,  --grep ip
              Search the iptables and ip6tables rules for a  match  (e.g.  IP,
              CIDR, Port Number)

       -i,  --iplookup ip
              Lookup IP address geographical information using CC_LOOKUPS set-
              ting in /etc/csf/csf.conf

       -t,  --temp
              Displays the current list of temporary allow and deny IP entries
              with their TTL and comment

       -tr, --temprm ip
              Remove an IP from the temporary IP ban or allow list

       -td, --tempdeny ip ttl [-p port] [-d direction] [comment]
              Add an IP to the temp IP ban list. ttl is how long to blocks for
              (default:seconds, can use one suffix of h/m/d).  Optional  port.
              Optional  direction  of  block  can  be one of: in, out or inout
              (default:in)

       -ta, --tempallow ip ttl [-p port] [-d direction] [comment]
              Add an IP to the temp IP allow list (default:inout)

       -tf, --tempf
              Flush all IPs from the temporary IP entries

       -cp, --cping
              PING all members in an lfd Cluster

       -cd, --cdeny ip
              Deny an IP in a Cluster and add to /etc/csf/csf.deny

       -ca, --callow ip
              Allow an IP in a Cluster and add to /etc/csf/csf.allow

       -car, --carm ip
              Remove   allowed   IP   in   a   Cluster   and    remove    from
              /etc/csf/csf.allow

       -cr, --crm ip
              Unblock an IP in a Cluster and remove from /etc/csf/csf.deny

       -cc, --cconfig [name] [value]
              Change configuration option [name] to [value] in a Cluster

       -cf, --cfile [file]
              Send [file] in a Cluster to /etc/csf/

       -crs, --crestart
              Cluster restart csf and lfd

       -w,  --watch ip
              Log SYN packets for an IP across iptables chains

       -m,  --mail [email]
              Display Server Check in HTML or email to [email] if present

       -lr, --logrun
              Initiate Log Scanner report via lfd

       -p, --ports
              View ports on the server that have a running process behind them
              listening for external connections

       --graphs [graph type] [directory]
              Generate System Statistics html pages and  images  for  a  given
              graph  type  into  a given directory. See ST_SYSTEM for require-
              ments

       --profile [command] [profile|backup] [profile|backup]
              Configuration profile functions for /etc/csf/csf.conf
              You can create your own profiles using the examples provided  in
              /usr/local/csf/profiles/
              The  profile  reset_to_defaults.conf  is a special case and will
              always be the latest default csf.conf

              list
              Lists available profiles and backups

              apply [profile]
              Modify csf.conf with Configuration Profile

              backup "name"
              Create Configuration  Backup  with  optional  "name"  stored  in
              /var/lib/csf/backup/

              restore [backup]
              Restore a Configuration Backup

              keep [num]
              Remove old Configuration Backups and keep the latest [num]

              diff [profile|backup] [profile|backup]
              Report  differences between Configuration Profiles or Configura-
              tion Backups, only specify one [profile|backup]  to  compare  to
              the current Configuration

       -c,  --check
              Check for updates to csf but do not upgrade

       -u,  --update
              Check for updates to csf and upgrade if available

       -uf    Force an update of csf whether and upgrade is required or not

       -x,  --disable
              Disable csf and lfd completely

       -e,  --enable
              Enable csf and lfd if previously disabled

       -v,  --version
              Show csf version

try these

Code:

       -dr, --denyrm ip
              Unblock an IP and remove from /etc/csf/csf.deny

       -tr, --temprm ip
              Remove an IP from the temporary IP ban or allow list

Code:

csf -dr IP
csf -tr IP