Article 9.1 - UFW (Uncomplicated Firewall) — Recommended for Most Users
Article 9.1 - UFW (Uncomplicated Firewall) — Recommended for Most Users Short answerInstall UFW, set default deny incoming, allow SSH/HTTP/HTTPS, enable only after SSH port…
Networking & Firewall
iptables, UFW, fail2ban — full configurations
Article 9.2 - iptables — Production Rules
Article 9.2 - iptables — Production Rules Short answerUse iptables for granular control: default DROP input, allow established, rate-limit SSH, open 80/443, persist with…
Article 9.3 - fail2ban Automated IP Banning
Article 9.3 - fail2ban Automated IP Banning Short answerInstall fail2ban, copy jail.local, enable sshd jail on your SSH port, start service, check bans with fail2ban-client…
How DNS Propagation Works
How DNS Propagation WorksShort answerDNS propagation is the wait while recursive resolvers refresh cached answers after you change a record. Speed depends on TTL,…
Common VPS Port Numbers
Common VPS Port Numbers Short answerOn an unmanaged VPSGrid VPS, common ports include SSH 22, RDP 3389, HTTP 80, HTTPS 443, and DNS 53. You must configure listeners and…
How to Point a Domain to Your VPS IP
How to Point a Domain to Your VPS IPShort answerCopy your VPS primary IP, create DNS A records for @ and usually www (or delegate nameservers), wait for propagation, then…
Understanding VPS Networking
Understanding VPS NetworkingShort answerPublic IPs, gateway, ports, firewalls, DNS, and routes. VPSGrid provides unmanaged hosting — you administer the guest OS,…
What Is a Dedicated IPv4 Address?
What Is a Dedicated IPv4 Address?Short answerExplains dedicated IPs, use cases, email, SSL, apps, and limitations. VPSGrid provides unmanaged hosting — you administer the…
How to Order a Dedicated IPv4 Add-on
How to Order a Dedicated IPv4 Add-onShort answerClient area/order flow, billing, assignment, activation. VPSGrid provides unmanaged hosting — you administer the guest OS,…
How to Use an Additional IPv4 Address
How to Use an Additional IPv4 AddressShort answerOS configuration basics, app binding, firewall, common mistakes. VPSGrid provides unmanaged hosting — you administer the…
What Is Reverse DNS or PTR?
What Is Reverse DNS or PTR?Short answerExplains PTR, forward-confirmed reverse DNS, mail server relevance. VPSGrid provides unmanaged hosting — you administer the guest…
How to Request a PTR Record Update
How to Request a PTR Record UpdateShort answerCustomer requirements, hostname, A record verification, support request. VPSGrid provides unmanaged hosting — you administer…
How to Check Reverse DNS
How to Check Reverse DNSShort answerdig/nslookup commands, online tools, propagation expectations. VPSGrid provides unmanaged hosting — you administer the guest OS,…
How to Test Network Connectivity
How to Test Network ConnectivityShort answerping, traceroute, mtr, curl, telnet/nc. VPSGrid provides unmanaged hosting — you administer the guest OS, applications, and…
How to Check Open Ports
How to Check Open PortsShort answerss, netstat, nmap basics, firewall vs app listener. VPSGrid provides unmanaged hosting — you administer the guest OS, applications, and…
How to Troubleshoot No Internet on a VPS
How to Troubleshoot No Internet on a VPSShort answerIP config, gateway, DNS, firewall, provider routing. VPSGrid provides unmanaged hosting — you administer the guest OS,…
IPv4 vs IPv6 for VPS Hosting
IPv4 vs IPv6 for VPS HostingShort answerDifferences, adoption, configuration basics, VPSGrid availability note. VPSGrid provides unmanaged hosting — you administer the…
