---
type: concept
title: Web Conferencing Troubleshooting
tags: [troubleshooting, network, bandwidth, firewall]
related: [jitsi-meet, bigbluebutton, dfnconf-pexip, groupware, universitatsrechenzentrum-urz]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_dienste_webdienste_webkonferenz_probleme_bei_webkonferenzen.md"]
---

# Web Conferencing Troubleshooting

Web conferencing troubleshooting is the systematic process of identifying, diagnosing, and resolving signal transmission, connection issues, or audio, video, and connection degradation during real-time digital meetings. The **Universitätsrechenzentrum (URZ)** provides a specific framework for diagnosing these problems.

## Diagnostic Process
When experiencing signal loss or poor quality, the following steps are recommended to determine the scope of the issue:

1. **Comparative Analysis**: Consult other participants to determine if the issue is isolated or widespread.
    - **Local Issue**: If only one participant's audio or video is impaired while others are clear, the problem is likely the user's internet connection or end device.
    - **Global Issue**: If all participants experience the same impairment, the problem may be related to the service provider or the conference host.
2. **Local Mitigation**:
    - **Reduce Signal Output**: Disable the camera and stop sharing presentations to lower bandwidth usage.
    - **Network Decongestion**: Disconnect other internet-enabled devices (Smart-TVs, smartphones, etc.) on the same network to prevent bandwidth congestion.
3. **Performance Testing**: Use the [[universitatsrechenzentrum-urz]] Speedtest to verify current bandwidth and stability.

## Technical Requirements

### Bandwidth Thresholds
For acceptable quality, the internet connection should meet the following minimums:
- **Speed**: $\ge 200\text{ KB/s}$ (approximately $1.0$ to $1.5\text{ Mb/s}$ download/upload).
- **Stability**: Ping and Jitter values should be as low as possible with minimal fluctuation/variance across multiple measurements.

### Firewall Port Configuration
Certain conferencing services require specific ports to be open in the firewall to function correctly and prevent communication from being blocked:

| Service | TCP Ports | UDP Ports |
| :--- | :--- | :--- |
| [[bigbluebutton]] | 80, 443 | 16384-32768 |
| [[jitsi-meet]] | 80, 443, 4443 | 10000 |
| [[dfnconf-pexip]] | 80, 443, 1720, 33000-39999, 5060, 5061, 40000-49999 | 1719, 40000-49999 |

## URZ Support Workflow
When reporting connection problems or submitting a support ticket via the [[groupware]] ticket system, the [[universitatsrechenzentrum-urz]] requires the following information:
- A **screenshot of the URZ Speedtest** (must include the current IP address).
- **Connection type** (e.g., wired/LAN or WLAN).
- **Internet provider** details.