...
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sudo cat /var/log/messages | grep pppd |
If you use firewalld with pptp, you will need to call following commands to add rules to firewalld
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sudo firewall-cmd --permanent --zone=public --direct --add-rule ipv4 filter INPUT 0 -p gre -j ACCEPT
sudo firewall-cmd --permanent --zone=public --direct --add-rule ipv6 filter INPUT 0 -p gre -j ACCEPT
sudo firewall-cmd --permanent --zone=public --add-masquerade
sudo firewall-cmd --reload |
https://www.lightning-ashe.com/develop/setup-pptp-server-on-centos/
https://linuxconfig.org/how-to-establish-pptp-vpn-client-connection-on-centos-rhel-7-linux