JuypterLab 503 : Service Unavailable (and Lab slow loading data)
Dong Ha Seo
12 Mar
Hi,
I am currently trying to launch the jupyterlab but I am getting an error "503 : Service Unavailable". I had the same issue before, and I pressed the 'restart from hub' button and pressed the "Stop my server" button as I did before to solve the issue. But this time, another error message comes up saying my server is not running. Is there an ongoing problem for the entire server or is it just my account that is not working?
I tried launching it again today and it worked this time!
Jasmine Fitzsimons
16 Mar
I have been having a similar issue since about noon EDT today - when initializing loadHalos and loadSubhalos the block of code will run for a very long time and never stops compiling. I have tried restarting the kernel and this does nothing.
Dylan Nelson
17 Mar
Since Feb 23 (2026) the general performance of the Lab when loading simulation data has become less predictable, and is sometimes (but not always) very slow.
Hi,
I am currently trying to launch the jupyterlab but I am getting an error "503 : Service Unavailable". I had the same issue before, and I pressed the 'restart from hub' button and pressed the "Stop my server" button as I did before to solve the issue. But this time, another error message comes up saying my server is not running. Is there an ongoing problem for the entire server or is it just my account that is not working?
Thank you!
I tried launching it again today and it worked this time!
I have been having a similar issue since about noon EDT today - when initializing loadHalos and loadSubhalos the block of code will run for a very long time and never stops compiling. I have tried restarting the kernel and this does nothing.
Since Feb 23 (2026) the general performance of the Lab when loading simulation data has become less predictable, and is sometimes (but not always) very slow.
We are currently looking into this more.