Need a Linux admin to restore access to the server with Plesk (error 502, unavailable on port 8443)

Linux & Unix, Software & Server Configuration — incorrectly specified categories?

63 USD

Client's review of cooperation with Anton Pleskanovsky

Need a Linux admin to restore access to the server with Plesk (error 502, unavailable on port 8443)

63 USD

Rating: 10/10. The specialist promptly identified the reasons for the unavailability, installed and configured fail2ban, restored the operation of nginx on the old CentOS 7 (found a working workaround), performed plesk repair web. Worked carefully, kept us informed, provided clear recommendations. We recommend for collaboration.

5.0

Boris Goldenberg

Reciprocal Feedback

28 September 2025

Freelancer's review of cooperation with Boris Goldenberg

Need a Linux admin to restore access to the server with Plesk (error 502, unavailable on port 8443)

63 USD

Everything went at a decent level. Truly German pragmatism, punctuality, and meticulousness. There were nuances due to the language barrier, but modern translation technologies resolved them. I recommend this client for collaboration, thank you!

5.0

Anton Pleskanovsky

Reciprocal Feedback

28 September 2025

Project translated automatically. Log in or register, to view the original

The server is "live" locally, but is not accessible from outside (from the internet). On the correct Plesk panel port 8443, we receive 502 Bad Gateway. We need a specialist in Linux + Plesk to find the cause and restore internet accessibility.

What is happening

We have been renting a "dedicated" server for a long time, and the provider does not offer admin support.
The Plesk panel should be accessible at https://<our-IP>:8443, but from outside we see HTTP 502.
Websites/panel are not accessible from outside (ports 80/443/8443).
Locally, the services appear to be running.
There is no SSH access.

What needs to be done

Network diagnostics and cause of 502:
- Check routing/public IP/NAT/ACL with the provider/on the edge equipment.
- Check Linux firewalls (nftables/iptables, firewalld, Plesk Firewall), fail2ban, possible DDoS filtering.
- Check the reverse proxy setup (nginx) → backend (apache/httpd or php-fpm, Plesk sw-cp-server).
- Check SSL/TLS and SNI on 443/8443 (certificates, chains, Let’s Encrypt auto-renewal).
Fixing accessibility:
- Achieve stable access to the panel on :8443 and websites on 80/443 from the internet.
- If necessary — correct reconfiguration of Plesk services (for example, sw-cp-serverd, psa, nginx, apache/httpd, php-fpm).
Report and prevention:
- Briefly describe the cause, changes made, where backups/configs are located.
- Provide recommendations: monitoring, alerts, backup access (IPMI/KVM/Rescue), backup policy.

Important details (Linux)

OS: Linux + Plesk (exact version to be confirmed).
Check systemd units: psa, sw-cp-server, nginx, apache2/httpd, php-fpm@*.
Logs for analysis:
- /var/log/plesk/panel.log
- /var/log/sw-cp-server/error_log
- /var/log/nginx/error.log and access logs of websites
- /var/log/httpd/error_log or /var/log/apache2/error.log (depends on the distribution)
- /var/log/fail2ban.log
Check Plesk extensions (Firewall, ModSecurity), systemd limits, ulimit, SELinux/AppArmor (if enabled), proxy/read/send timeouts in nginx.

Access/conditions

No SSH. Access is needed via IPMI/KVM/VNC/Rescue Mode (we will help organize this with the provider).
We are ready to coordinate with the provider on unlocking ports/ACL.

Requirements for the performer

Confident experience in Linux administration, Plesk, nginx/apache, network diagnostics (TCP, NAT, ACL, firewalls).
Experience in resolving 502 (upstream, timeouts, permissions, php-fpm sockets, port conflicts).
Attention to detail: backups of configs before changes, minimizing downtime.

What to include in the response

Briefly describe relevant cases (Linux+Plesk, 8443, 80/443, 502).
Proposed diagnostic plan (step by step).
Estimate of time and rate (fixed or hourly).
Willingness to sign an NDA (upon request).

Proposals 8 Discussions 4

Kirill Bystrov

3 0

Projects 3
Rating -
Rating 447

Budget: 60 EUR Deadline: 1 day

Hello, Boris

I have relevant experience and am a Linux admin, including a lot of work with Plesk and various hosting providers. As I understand, no one has helped you so far. Therefore, I will risk offering my assistance to achieve stability in the panel's operation + clarify the nuances with the service provider (servers). Consultation and recommendations are included. 2-month guarantee on the completed work. Please contact me via private message to discuss the project and details.

Anton Pleskanovsky

Winning proposal

122 1

Budget: 55 EUR Deadline: 2 days

Good afternoon, Boris!

There is a way to solve your problem, we discussed it yesterday.
If the host does not resolve the issue on their own, please reach out, we will work on it!

Dmytro Lavryk

199 1

Budget: 55 EUR Deadline: 1 day

Contact me - I will do my best. I have the necessary experience. PMI/KVM/VNC/Rescue Mode will work.
Over 25 years of administration experience.
Examples of clients for whom I have configured and support servers can be viewed on my website and in my portfolio on this exchange.
If desired, work under a contract with payment to the current account is possible (I am a private entrepreneur, group 3).

Clients with the status of combatants and their families receive a 15% discount on all services.

30% of the money earned at this rate will be donated to support the Armed Forces of Ukraine.