Karanbir S.

Need a Linux server secured, hardened, migrated, troubleshot or properly configured? I help businesses manage Linux infrastructure, resolve server and website security issues, remediate vulnerabilities, recover compromised environments and keep production systems stable and secure. I’m a Linux System Administrator and server security specialist with 10+ years of industry experience, including work involving Fortune 500 companies and U.S. government projects. On Upwork, I have built a 100% Job Success Score, Top Rated status, $50K+ in earnings and 1,700+ hours of completed work. My strongest experience is in Linux server administration, RHEL/Red Hat environments, VPS infrastructure, server security, security hardening, vulnerability remediation, migrations and troubleshooting. I’m comfortable working on production environments where reliability, security and careful change management matter. 🔐 SERVER SECURITY & HARDENING • Linux server security and security hardening • RHEL / Red Hat security configuration • Vulnerability assessment and remediation • VAPT remediation • Security patching and system updates • Malware investigation and removal • Compromised server and website recovery • WordPress security and hacked website cleanup • SSL/TLS security configuration • Firewall and access-control configuration • SSH security and server access troubleshooting • Root-cause analysis and security-focused troubleshooting 🖥️ LINUX SYSTEM ADMINISTRATION • RHEL / Red Hat Enterprise Linux • Ubuntu and CentOS • Linux server installation and configuration • Server administration and maintenance • VPS administration • Dedicated and cloud server environments • cPanel / WHM • Plesk and Webmin • Nginx and Apache • PHP server environments • MySQL/database-related server issues • Server monitoring, maintenance and performance troubleshooting ☁️ VPS, CLOUD & SERVER MIGRATION • VPS setup and configuration • Linux server migration • Website and hosting migration • AWS / cloud server environments • DigitalOcean and other VPS/cloud providers • DNS migration and configuration • SSL certificate installation and migration • Cloudflare configuration • Post-migration troubleshooting and verification • Migration planning with a focus on minimizing downtime 🌐 WEBSITE & HOSTING SECURITY Many website problems are actually infrastructure problems. A WordPress error, malware infection, SSL issue, DNS failure, slow website or recurring vulnerability can originate from the underlying server or hosting environment. I can investigate problems across both layers — the application and the server — instead of treating only the visible symptom. I regularly work with: • WordPress and PHP environments • Apache / Nginx web servers • cPanel / WHM, Plesk and Webmin • DNS, SSL/TLS and Cloudflare • Hosting and VPS environments • Server configuration and website integration issues 🚨 PROBLEMS I CAN HELP WITH • Linux server errors or configuration problems • RHEL/Ubuntu server administration • Server security vulnerabilities • Security hardening after a vulnerability assessment • Hacked or infected WordPress websites • Malware on websites or servers • VPS migration and hosting migration • Website downtime after migration • Nginx, Apache or PHP configuration issues • cPanel / WHM server issues • DNS, SSL and Cloudflare problems • Server performance and reliability issues • Ongoing Linux server administration and maintenance WHY CLIENTS HIRE ME I focus on solving the underlying problem rather than applying a temporary workaround. When appropriate, I investigate the root cause, fix the issue, verify the environment and recommend practical measures to prevent the same problem from recurring. My Upwork history includes substantial Linux and security engagements, including: ✓ Long-term Red Hat Linux administration ✓ RHEL8 server configuration ✓ RHEL8 vulnerability remediation and security hardening ✓ Website infection and server issue remediation ✓ VPS and website migrations ✓ WordPress vulnerability and security fixes ✓ Linux server troubleshooting and administration I have worked across environments involving platforms and providers such as RHEL/Red Hat, Ubuntu, CentOS, AWS, DigitalOcean, cPanel, WHM, Plesk, Webmin, Nginx, Apache, Cloudflare, GoDaddy, Hostinger, Contabo and Hetzner. If you need a reliable Linux System Administrator for server administration, RHEL/Ubuntu support, security hardening, vulnerability remediation, server migration, VPS management or website/server security, send me the details of the environment and the issue you’re facing. I’ll review the requirements and help you determine the right approach before we get started.