===== Problems logging in to Open OnDemand =====

Open OnDemand is available from on or off-campus at https://ood01.comet.hpc.ncl.ac.uk/ 

==== Common errors ====

=== 400 Bad Request ===
<WRAP round box 60%>
**400 Bad Request** \\
Your browser sent a request that this server could not understand.\\
Size of a request header field exceeds server limit.
</WRAP>

This error may be caused by having a lot of cookies cached for this site.  Clear your browser cache to fix.

=== Error -- can't find user ===
<WRAP round box 60%>
%%Error -- can't find user for user@ncl.ac.uk%%\\
Run 'nginx_stage --help' to see a full list of available command line options.
</WRAP>

Note that the user has logged in using @ncl.ac.uk as their domain.  Your canonical (original) campus username in Azure/Entra is your loginID@newcastle.ac.uk.  Other names like my.name@ncl.ac.uk are aliases for this canonical name and won't always work to log you in to services which authenticate against Azure/Entra.

Always log in to Open OnDemand with **yourID@newcastle.ac.uk** \\
For example: na123@newcastle.ac.uk or c1234567@newcastle.ac.uk

If your browser has remembered a different login, use a new incognito mode window to force re-authentication:

{{:faq:screenshot_from_2026-07-07_15-09-45.png?nolink&400|Azure login}}

[[:faq:index|Back to FAQ]]