Hello,
I'm facing issues regarding HDP stack maintenance upgrade from 2.5.5.0 to 2.5.6.0 :

Ambari was first successfully upgradedfrom 2.5.0 to 2.5.1 following upgrade guide.
Then I tryied to upgrade HDP stack from 2.5.5.0 to 2.5.6.0 but without success.
The first issue I encounter is an empty page when I want to check then current HDP stack version details :

However, the HDP 2.5.6.0 stack details show up without problem. This version was created by uploading HDP-2.5.6.0-40.xml :

The second issue occures when I try to install the new stack version by using the « Intall on ... » button. I am then redirected to another page but nothing happends :

From here, I do not know where to look for possible troubleshooting and/or error messages. Nothing clear appears in Ambari nor system logs . I have searched for more info but was not able to solve those two issues (are they connected?).
As a background information, the whole setup is running on RHEL7 and was deployed using a local repository (Satellite). SELinux is set to enforce but does not seems to be the root cause since permissive mode does not solve the issue either.
Does anyone have already faced this kind of issue ? If so, how did you fixed it?
Thank you for your help.