Seeking Help with Airflow Issue: 'No host supplied' Error

[maciej_matusiak]

Hello Experts,

Has anyone experienced an "Invalid URL 'No host supplied'" error with Airflow 2.10.5?

I'm reaching out because I've encountered a perplexing issue with Airflow, which serves as our SAS Viya scheduler. For the first time in over a year, all tasks started failing immediately with the following error:

*** Could not read served logs: Invalid URL 'http://:8793/log/dag_id=Refresh_Access_Token/run_id=manual__2025-09-13T21:18:17.605508+00:00/task_id=update_token/attempt=1.log': No host supplied

The problem is particularly strange because our system architecture hasn't changed, and the issue doesn't appear on our test environment, which has an identical setup. The only temporary solution we've found is a complete reinstallation of Airflow. A simple reset, which is often suggested, didn't work. After reinstallation it works just fine.

This seems to be a more widespread issue, as I've found similar reports on the Apache Airflow GitHub:

• https://github.com/apache/airflow/issues/51512

• https://github.com/apache/airflow/issues/42136

The discussions there suggest that this is an unresolved problem with Airflow itself, not an issue stemming from our SAS Viya implementation. This is why I'm hoping someone within this forum might have found a better, more permanent workaround.

Any insights or suggestions would be greatly appreciated.

Thank you.