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Created attachment 1287236 [details]
Screenshot

Description of problem:
When creating host collection copy with invalid name (e.g. 300 chars long), pressing on `Create` button does nothing, there are no visible validation messages. Only console shows that POST request (POST https://sat6.com/katello/api/v2/host_collections/16/copy) returned `422 Unprocessable Entity`.

Version-Release number of selected component (if applicable):
Sat 6.3.0 Snap 2.0:
* satellite-6.3.0-15.0.beta.el7sat.noarch
* foreman-1.15.0-1.el7sat.noarch
* katello-3.4.0-3.el7sat.noarch

How reproducible:
Always

Steps to Reproduce:
1. Navigate to Hosts / Host Collection
2. Select any exising host collection or create one
3. Select Action / Copy Host Collection
4. Insert invalid new name
5. Press create
6. Check for validation messages and/or browser console for logs

Actual results:
Clicking on create button does nothing

Expected results:
Visible validation message

Additional info:

Created redmine issue http://projects.theforeman.org/issues/20011 from this bug

Moving this bug to POST for triage into Satellite 6 since the upstream issue http://projects.theforeman.org/issues/20011 has been resolved.

Verified on 6.3.0 snap 9, I now see:

Validation failed: Name is too long (maximum is 255 characters)

Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA.
> 
> For information on the advisory, and where to find the updated files, follow the link below.
> 
> If the solution does not work for you, open a new bug report.
> 
> https://access.redhat.com/errata/RHSA-2018:0336