Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Rangchi's avatar
Rangchi
Icon for Nimbostratus rankNimbostratus
Feb 10, 2024

Host inaccessible

Hello, I updated the Big-Ip i15800 device. Then the screen displays the error "Host inaccessible or diagnostic mode" and the operating system stops working. Could anyone help? Thanks  
security
Rangchi's avatar
Rangchi
Icon for Nimbostratus rankNimbostratus
Feb 10, 2024

AOM console is not useful for this problem. 

 Also this link ''https://my.f5.com/manage/s/article/K11400446'' will be worked when we Have access to the TMOS. Are there any solution? Please Help me.

Thanks

 

boneyard's avatar
boneyard
Icon for MVP rankMVP
Feb 10, 2024

You didnt answer what the console is showing or not. If there is no output and your console connection is correct and working then the system might just be broken.

 

If this doesnt help you, you can always call F5 support, they are there to help with time critical issues and provide personal support.