[GH-ISSUE #998] UDP port is inaccessible #1619

New Issue

saavagebueno · 2026-08-05T00:43:16-04:00

saavagebueno commented

2026-08-05 00:43:16 -04:00

Originally created by @fbzhong on GitHub (Jun 30, 2023).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/998

Describe the problem
It seems like any UDP based services are inaccessible between nodes even if "Allow ALL between SRC and DEST" is enabled in access control.

To Reproduce
Steps to reproduce the behavior:

Enable "Default" rule in Access Control page.
Listen udp port in one node by executing "nc -ul 5001"
Execute the following command to test udp port on other node 'echo "hello" | nc -u {{node_ip}} 5001'
See error

Expected behavior
There is "hello" printed in server node.

Originally created by @fbzhong on GitHub (Jun 30, 2023). Original GitHub issue: https://github.com/netbirdio/netbird/issues/998 **Describe the problem** It seems like any UDP based services are inaccessible between nodes even if "Allow ALL between SRC and DEST" is enabled in access control. **To Reproduce** Steps to reproduce the behavior: 1. Enable "Default" rule in Access Control page. <img width="1158" alt="image" src="https://github.com/netbirdio/netbird/assets/479845/92aa572a-f3f8-4088-898e-deae38dba793"> 2. Listen udp port in one node by executing "nc -ul 5001" 3. Execute the following command to test udp port on other node 'echo "hello" | nc -u {{node_ip}} 5001' 4. See error **Expected behavior** There is "hello" printed in server node.

saavagebueno referenced this issue

2026-08-05 00:48:15 -04:00

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saavagebueno referenced this issue

2026-08-05 00:48:53 -04:00

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Reference: DYNR/netbird#1619