Encountering connection issues to 192.168.18.238:20190? Follow these precise troubleshooting steps:
Verify Target Device Status
Ensure the target device at 192.168.18.238 is powered on and connected to the network. Physically inspect network indicator lights and confirm other devices can access the same subnet.
Check Network Connectivity
Perform basic network tests:
- Ping the IP: ping 192.168.18.238
- Verify port status: telnet 192.168.18.238 20190 (connection failure indicates blocked port)
- Confirm subnet masking matches other devices in the network
Inspect Local Firewall Settings
Temporarily disable firewalls on your workstation:
- Windows Defender Firewall → "Turn off" temporarily
- Third-party security software → Deactivate network protection
- Corporate networks: Contact IT if group policies restrict access
Validate Service Status
On the target machine (192.168.18.238):
- Confirm application/service bound to port 20190 is running
- Check for service-specific logs indicating connection rejection
- Restart the service: sudo systemctl restart [service-name]
Examine Router/Intermediate Devices
When applicable:
- Check for ACLs blocking port 20190 on managed switches
- Verify VLAN configurations isolate the IP properly
- Inspect port security settings on network appliances
Reset Network Components
Execute in this sequence:
- Reboot client machine → Flush DNS: ipconfig /flushdns
- Restart target device at 192.168.18.238
- Power-cycle network switches/routers between devices
If errors persist, inspect client-side application configurations or analyze network traces using tools like Wireshark for TCP SYN rejection patterns.
