Shore Up

About the author

Ketan Aagja

Director — IT · 22+ years in infrastructure, security & mail systems

A seasoned IT professional with more than two decades leading large-scale operations across IT strategy, infrastructure management, cybersecurity and cloud — from mail servers and networks to the policies that keep them compliant.

Everything here comes from real production systems: mail servers I actually run, configurations I actually deployed, and the scripts I wrote to stop doing the same job twice. Not theory — what worked, and why. Most of it is Linux, Zimbra, Dovecot, Postfix, OpenLDAP and iRedMail, plus the Windows and security work that surrounds them. If something here saves you an afternoon, it has done its job.

My companies:Jenria Infotech ↗Jara Technologies (UK) ↗

Credentials

The background behind the guides.

CCNP
Cisco Certified Network Professional

Enterprise networking, at depth.

CCNA
Cisco Certified Network Associate

Routing, switching and network fundamentals.

CEH
Certified Ethical Hacker — EC-Council

Defending enterprise networks against real threats.

Experience

  1. Jenria Infotech LLP · Jara Technologies Ltd (UK)

    2026 – Present

    Founder & CEO · Director

    My own companies — delivering enterprise networking and security, and custom AI solutions for businesses.

  2. Topia Life Sciences

    2020 – 2025

    Director — IT

    Led IT operations across five sites in India and two in the UK, with a team of 300+ professionals.

  3. Gowrie Healthcare

    2010 – 2020

    IT Head

    Rolled out enterprise firewalls, data-security protocols and backup systems protecting sensitive data.

  4. Fortune Infotech

    2007 – 2010

    Network Administrator

    Designed and maintained enterprise networks — VPNs, VLANs and SANs.

  5. Swambe Chemicals (SORBEAD INDIA) Pvt. Ltd.

    2003 – 2007

    Network Administrator

    Ran the enterprise Windows network end to end — user accounts and rights, network security, servers, backups, and PC and printer support across the site.

  6. Technet Online Pvt. Ltd.

    2002 – 2003

    System / Network Administrator

    Hands-on system and network administration — installing and troubleshooting desktops, servers, printers and connectivity for daily operations.

Where the depth is

Enterprise policy & compliance95%
Leadership & team development90%
IT strategy & digital transformation90%
Networking & communication85%

Technical expertise

The hands-on toolkit behind two decades of infrastructure work.

Networking
Troubleshooting and supporting client/server and wireless technologies.
Network administration
Design, implementation and maintenance of Windows network systems for the enterprise — user accounts, network security, user-rights management, printer support, backup devices and data, and installing, configuring and troubleshooting servers.
Security
Managing networks with security hardware, securing the LAN, and packet-level network software management.
Hardware
Install, configure, troubleshoot and maintain PC hardware and peripherals — desktops, printers, scanners, modems and networked printers; all PC variants, video capture, and cabling standards (CAT5, CAT6, fibre).
Operating systems
Windows 95/98/2000/XP and 2003–2022 Server, MS-DOS, RedHat Linux server/client, CentOS 5.4–9, and Ubuntu Server variants.
Security software
ISA Server, SonicWALL, Cisco PIX and Websense.
Environments & protocols
Windows workgroups and domains, Ethernet, TCP/IP, Windows directory service, Terminal Services, DHCP, DNS, Samba domain services, and Bind9/Named.

Why this blog exists

Two decades of running production infrastructure teaches the same lesson over and over: the useful writing is the kind that has actually been run. That is what Shore Up is — practical, tested guides for the people who keep Linux and Windows systems, mail servers and networks alive.

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