Youtube preview not working

[V_007]

Hi All,

Im facing an weird problem in my network where youtube works but not preview. And this also for such users in  group policies where youtube is allowed . PFA Error image.

My Content categories is like where in Category Blocking i have blocked Streaming Media whereas in url category youtube is allowed.

[RaphaelL]

Have you checked the event logs on the MX ? Usually a content filtrering blocked domain will be logged. That would be a good indicator of the issue.

[V_007]

Not getting an any clue behind site is opening but preview not. Below is my Content filtering configuration

Category i have blocked : Streaming media

Url filtering blocked rule  : www.youtube.com
*.youtube.com
gvt1.com
r3---sn-ni5f-t8gz.gvt1.com
r2---sn-ni5f-t8gs.gvt1.com
ytimg.com
r3---sn-ni5f-t8gs.gvt1.com
ytimg.l.google.com

Group policies allowed url : www.youtube.com
*.youtube.com