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For the last decade a Debian machine on our vessel has been flawlessly running a set of Perl scripts that squash outgoing mail, hand it to an Iridium modem and deliver it to my shore-side mail server. Incoming messages follow the reverse path. Suddenly nothing moves in either direction. Here is what I already know and have ruled out: • The Iridium link itself passes its own internal tests. • DNS on the ship resolves the server name correctly. • Both the shipboard PC and the land-based server have been rebooted. • No recent configuration changes were made. • A Kerio Connect firewall sits in front of the mail server. Given that, I suspect the mail server is at fault, but I am not yet sure whether it still exchanges mail with any source other than the ship. I therefore need a seasoned mail-flow troubleshooter who is comfortable with Linux, Kerio Connect, SMTP diagnostics, log analysis and, if necessary, Perl-based hand-offs. Deliverables I need from you: 1. Remote investigation (log review, test messages, flow tracing) to pinpoint the exact break in the chain—mail server, firewall rule, SMTP auth, queue corruption, etc. 2. Concrete fix implemented or clear instructions I can apply immediately to restore full bidirectional email between ship and shore. 3. A brief report summarising root cause and the steps taken so we can avoid a repeat. Once mail is flowing again and confirmed from both ends, the job is done.
Project ID: 40454061
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34 freelancers are bidding on average €144 EUR for this job

Hello, I have 10 years of experience in diagnosing and resolving complex email flow issues. I am well-versed with Linux systems, Kerio Connect, and SMTP diagnostics. I propose to remotely investigate your email outage, starting with log analysis and flow tracing. I will provide either an immediate fix or detailed steps for restoring email communication. Finally, I will deliver a concise report detailing the root cause and resolution. Regards, VishnuLal NB*
€200 EUR in 1 day
7.5
7.5

Good afternoon! I'll remotely diagnose your Debian/Kerio Connect mail chain by pulling SMTP logs from both ends, running test messages through the flow, checking firewall rules and SMTP auth, inspecting the Perl hand-off scripts, and tracing exactly where the bidirectional break sits. Once the fault is isolated I'll implement the fix and deliver a concise root-cause report so this does not recur. Any specific access method you prefer for the remote session, such as SSH or a web admin panel?
€100 EUR in 3 days
5.3
5.3

Hello Sir/ Mam I have checked Requirements As a seasoned developer with a wealth of Experience in Web Development I'm confident I can bring your virtual reality project to life. My track record as demonstrated in my 100% job completion and 5-star review rating showcases My ability to deliver exceptional results on time and with utmost quality I believe that my skill set makes me the ideal candidate for this project Please come on chat we will discuss more about this I will be waiting for your reply . Thank you !
€140 EUR in 1 day
4.4
4.4

Interesting project, I will trace the full mail path — Perl scripts, SMTP handoff, Kerio Connect queues, and firewall rules — to isolate exactly where messages stall. You will get the fix applied and a root-cause summary document. First step: I will pull Kerio Connect logs and run a manual SMTP session against port 25/587 to confirm whether the server accepts mail at all. This quickly separates a firewall or auth issue from a deeper queue or relay problem. Questions: 1) Do you have SSH access to both the shipboard Debian box and the shore-side server ready to share? 2) Has the Kerio Connect license or SSL certificate expired recently? Ready to start whenever you are. Kamran
€33 EUR in 10 days
4.1
4.1

Hello dear, Greetings from MD. Toriqul Islam! We are a dedicated Web Design & Development team with over 10+ years of industry experience. I’m Engineer Toriqul Islam, an experienced Computer Science & Engineering graduate from RUET. We specialize in building modern, scalable, and user-friendly digital solutions tailored to business needs. What I Offer We help businesses grow online by delivering: • Clean, modern, and responsive website designs • High-performance and scalable web applications • User-focused UI/UX for better engagement and conversion My Technical Expertise We work across a wide range of technologies, including: • Frontend: HTML5, CSS3, Bootstrap, JavaScript, jQuery, Angular, React • Backend: Node.js, PHP, Laravel, .NET, CodeIgniter, Ruby on Rails, Python • CMS & Platforms: WordPress • Database: MySQL, MongoDB • Mobile Development: React Native, Flutter, and more Why choose me? ✔️ Clean, optimized, and well-documented code ✔️ Reusable and scalable components ✔️ On-time delivery with complete requirement fulfillment We are confident in our ability to turn your ideas into a powerful digital product. Let’s discuss your project and make it a success. Looking forward to working with you! Best Regards, Md. Toriqul Islam
€65 EUR in 2 days
4.2
4.2

Hello, I’m an IT expert with over 20 years of experience in the industry. I hold certifications as a Cisco Certified Networking Professional (300-100 and 300-115), Linux Certified Professional (LPI 101, 102, 103), Red Hat Certified System Administrator, VMware Certified Professional (versions 4, 5, and 5.5), as well as being a Microsoft System Administrator/Engineer from 2003 to 2022 and AZ104
€100 EUR in 1 day
3.9
3.9

Hi, I have experience troubleshooting Linux mail systems, SMTP delivery issues, Kerio Connect environments, firewall/mail-flow diagnostics, and Perl-based mail processing workflows. I can help trace the full ship-to-shore mail path, identify the exact failure point, restore bidirectional email flow, and provide a clear root-cause summary with corrective actions to prevent future outages. Best regards, Shakila Naz
€100 EUR in 7 days
3.3
3.3

Hi I can troubleshoot and resolve your ship-to-shore mail flow failure. I have extensive experience with Linux systems, SMTP diagnostic tracing, log analysis, and mail server routing. To fix this, I will analyze the SMTP transaction logs on both the Debian machine and the shore-side mail server while inspecting the Kerio Connect firewall rules for blocked ports or dropped packets. I will trace the Perl script hand-offs and test SMTP authentication to locate and eliminate the exact block in your transmission chain. I am available to start immediately and can restore your bidirectional email delivery quickly. Please reach out so we can discuss server access and get your mail moving again. cheers Nehal
€140 EUR in 7 days
3.3
3.3

Hello There! Hope you are doing fine. I have deep experience troubleshooting SMTP mail flows on Linux and Kerio Connect. I will remotely review mail logs, test message paths, check firewall rules, SMTP auth, and queue integrity. I will pinpoint the exact break in the chain and either fix it or give you clear instructions. I will restore full bidirectional email between ship and shore and provide a root cause report. Please start a chat to share access details. Best regards, Md Ruhul Ajom
€50 EUR in 3 days
2.6
2.6

Hey there, I’ve read your call for help and am ready to dive into the mystery of the silent shipboard mails. With solid experience troubleshooting Linux mail flows, Kerio Connect setups, and crafting Perl scripts for smooth mail handoffs, I’m confident I can pinpoint why your outgoing and incoming emails have hit the doldrums despite the Iridium link’s green light. I’ll start remotely by dissecting logs, scrutinizing SMTP flows, and testing message paths to isolate the glitch, whether it’s a sneaky firewall rule, an authentication hiccup, or a misbehaving mail queue. Once identified, I’ll either fix the issue directly or guide you through a swift recovery plan. Finally, expect a concise report highlighting the root cause and prevention tips so your ship’s mail sails smoothly again. Ready to set sail on solving this? I propose kicking off immediately with a day dedicated to deep diagnostics and fixes. What email server logs and firewall access can you provide for initial troubleshooting? Best regards,
€155 EUR in 12 days
2.4
2.4

Shore-side logs first. When the Perl-to-Iridium bridge goes silent with no local change, Kerio's the more likely culprit: an auto-applied rule or expired cert kills the handoff cleanly while Iridium itself tests fine. I'd start with Kerio's connection log around the outage window plus a manual SMTP submission from a different external IP. That confirms whether shore accepts at all and flags an IP-keyed block or cert rejection. If shore passes, I shift to the vessel side: Perl wrapper logs, mailq state, the Iridium handoff binary in debug mode, and whether a prior run left a lock file. M1: Root cause identified, EUR 110, 1d. M2: Fix applied, verified, written triage doc, EUR 110, 1d. Does Kerio log dropped connections, or allowed traffic only?
€220 EUR in 2 days
1.6
1.6

Hi there, THE CHALLENGE is diagnosing and resolving a sudden email outage on a Debian machine aboard a vessel that has been running Perl scripts flawlessly for a decade. Despite ruling out various potential issues, the exact cause of the outage remains elusive. The technical difficulties lie in pinpointing the exact break in the mail flow chain, potentially involving the mail server, firewall rules, SMTP authentication, or queue corruption. As a seasoned troubleshooter comfortable with Linux, Kerio Connect, SMTP diagnostics, log analysis, and Perl-based hand-offs, I would remotely investigate the issue by reviewing logs, testing messages, and tracing the flow to identify the root cause. Once identified, I would implement a concrete fix or provide clear instructions to restore bidirectional email communication between the ship and shore, followed by a detailed report outlining the steps taken to prevent future occurrences. Regards, Matheus
€140 EUR in 7 days
0.6
0.6

Hi, I will quickly diagnose the mail flow issue affecting your Debian machine and ensure seamless bidirectional email communication. My extensive experience with Linux, SMTP diagnostics, and log analysis, combined with familiarity with Kerio Connect, positions me perfectly to pinpoint the break in the chain. I’ll start by reviewing logs and testing messages to identify whether the issue lies with the mail server, firewall configurations, or SMTP authentication. Once the root cause is confirmed, I will implement a concrete fix or provide clear instructions for you to follow. Additionally, I will prepare a brief report summarizing the findings and the steps taken to prevent future occurrences. Are there any specific logs or tests you would like me to prioritize? I’m ready to get started immediately to restore your email flow. Thank you.
€156 EUR in 7 days
0.0
0.0

Hi there, I reviewed your project carefully, and I can help you pinpoint and restore the broken bidirectional mail flow between the Debian shipboard system, Iridium hand-off, Kerio Connect firewall, and shore-side mail server. Why I’m a good fit: • Strong Linux/Debian, SMTP, mail queue, firewall, and log-analysis troubleshooting experience • Comfortable tracing mail flow end to end across remote systems, auth, DNS, ports, queues, and server-side rules • Able to work with legacy Perl/Shell hand-off scripts without disrupting a long-running setup I have experience with Debian mail systems, Kerio-style edge filtering, SMTP diagnostics, and remote incident recovery involving blocked delivery paths, broken authentication, and corrupted queues. My approach: • Review logs and test controlled messages from both directions • Isolate the exact failure point quickly • Apply the fix or provide precise steps, then document root cause I can start immediately and help confirm mail flow from both ends. Best regards,
€240 EUR in 2 days
0.0
0.0

Hi, I’ll quickly diagnose and resolve the mail flow issues between your Debian machine and the shore-side mail server. My expertise with Linux, SMTP diagnostics, and Kerio Connect equips me to pinpoint the break in the chain, whether it’s a firewall rule, authentication issue, or a problem with the mail server itself. I’ll remotely investigate logs, conduct tests, and trace the mail flow to identify the root cause. Upon identifying the issue, I will implement a concrete fix or provide clear, actionable instructions. Additionally, I will prepare a brief report summarizing the findings and recommendations to prevent future occurrences. Given the urgency of restoring mail functionality, I’m ready to start immediately. Let’s get your email flowing again. Thank you.
€156 EUR in 7 days
0.0
0.0

Hello, I can help troubleshoot and restore the complete ship ↔ shore mail flow by tracing the entire chain from the Debian system and Perl handoff scripts through Kerio Connect and SMTP delivery. What I’ll handle: • Review logs and queues on both shipboard and shore systems • Trace message flow end-to-end with SMTP diagnostics • Check Kerio rules, authentication, queues, certificates, and firewall behavior • Inspect Perl handoff scripts and UUCP/mail integration if needed • Identify the exact failure point and implement the fix or provide immediate action steps Deliverables: • Root cause identification • Working bidirectional mail flow restored • Brief report with findings, commands used, and prevention recommendations Estimated turnaround: same day after remote access depending on issue complexity. Ready to start immediately.
€140 EUR in 7 days
0.0
0.0

Hi, I will diagnose and resolve the mail flow issue between your Debian machine and the shore-side mail server. With my extensive experience in Linux, Kerio Connect, and SMTP diagnostics, I can quickly identify the root cause of the disruption. I’ll conduct a thorough investigation of logs, test messaging, and flow tracing to pinpoint whether the problem lies with the mail server, firewall rules, or SMTP authentication. I suspect there may be an issue with the Kerio Connect firewall or potential queue corruption that’s preventing bidirectional communication. My approach will ensure that I provide a concrete fix or clear instructions for immediate application. After restoring functionality, I will deliver a concise report summarizing the root cause and steps taken to prevent future occurrences. Let’s get your mail system operational again. Thank you.
€30 EUR in 7 days
0.0
0.0

⭐⭐⭐⭐ Nice to meet you ⭐⭐⭐⭐⭐ Hello, it's my happy to collaborate with you. Experience: 8+ years in Linux system administration, SMTP troubleshooting, Debian server maintenance, and mail-flow diagnostics involving Kerio Connect, Perl automation scripts, and firewall/network debugging. I think that main focusing is identifying the exact break point in the ship-to-shore mail flow, restoring stable bidirectional email delivery, and ensuring the issue does not repeat again. Work flow Log Review & SMTP Diagnostics → Mail Queue & Firewall Investigation → Perl Script Flow Validation → Kerio Connect Troubleshooting → Mail Flow Restoration → Final Testing & Root Cause Report Expected COST&&TIME(Not ensure about these and want to discuss with you) COST: €180&&TIME 2–3 Days I will give you best satisfied result to you in short time. I am really happy to face this project |||| Vinay S.
€180 EUR in 3 days
0.0
0.0

Hi, I can help stabilize and optimize your Windows 10 Pro + UCCNC setup for reliable CNC operation. I have experience troubleshooting Windows performance issues, startup conflicts, driver behavior and automation tasks for dedicated machine-control systems. Based on your requirements, I can help resolve the startup crashes, improve software launch speed and fix compatibility issues so the machine operates consistently every time it powers on or shuts down. I can also configure: • Automatic startup behavior • Helper scripts, batch files and Task Scheduler jobs • Windows optimizations focused on motion-control stability • Reliable startup and shutdown procedures • Reproducible setup documentation for other shop PCs My goal is to deliver a stable and fully tested configuration focused on reliability, predictable machine behavior and smooth day-to-day operation. I’m available to discuss your current setup, controller hardware and any existing scripts or plugins involved. Thank you for your consideration.
€140 EUR in 7 days
0.0
0.0

Hello Sir, As a seasoned Senior Full Stack & DevOps Engineer with 9+ years of experience, I'm confident in my ability to not only pinpoint the exact break in the chain affecting your ship's email communication, but to also deliver concrete solutions promptly. My expertise extends beyond simple infrastructure management, I am well-versed in troubleshooting and resolving complex issues across the entire data flow, from backend architecture, cloud and DevOps to massive data systems. I understand your concern about a potential disturbance to your business and that is why I approach every task with urgency and efficiency. Given your description, I suspect the issue may be with the mail server or its interactions with the other components. With my comprehensive skills in Linux and Shell Scripting, as well as solid understanding of SMTP protocol that powers email exchange, I am equipped to analyze your logs meticulously, perform necessary tests & provide a clear resolution strategy. Furthermore, my ability to build robust systems from front-end to backend guarantees that any fix I implement will not just solve this immediate issue but lay a foundation of reliability for your entire email system moving forward. More importantly, I am committed to keeping you informed throughout the process via concise, insightful reports that help prevent future recurrences. The strength of my work lies in building exceptional systems that scale, so let's buil Thanks! John
€155 EUR in 2 days
0.0
0.0

Papenburg, Germany
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