Throughout the 1 065 day period beginning on December 30, 2021, festung.koeln's operability was checked 2 times. Throughout all checks, the operability of festung.koeln was confirmed 1 times, as evidenced by the code 200 on February 25, 2022. Tests conducted as of November 30, 2024, found no instances of festung.koeln becoming inoperable. On December 30, 2021, the latest error code 502 was reported from the 1 error responses recorded. Festung.koeln's response time of 0.989 seconds on February 25, 2022, contrasted its 0.510 seconds average.