Why we are having problem connecting to all streaming media platforms?

INBK_IT

We are having problem conncting streaming media platforms. We are getting dnsft.cloud.zyxel.com errors. We cannot reach youtube, vimeo, vudu, plex, etc.

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Zyxel_Jeff

We found that the root cause is related to the DNS servers' (192.170.X.X) cache. We suggest you clean the DNS servers' cache and can resolve this problem.

We tried to nslookup youtube via Google DNS server 8.8.8.8 and can be resolved normally, but if nslookup youtube via the DNS server 192.170.X.X would be failed. Thanks.

Zyxel_Jeff

Dear @INBK_IT

It belongs to the Content Filter's certificate. Please check your Content Filter profile whether blocks media-related categories. If so, you can cancel it or add those media websites to the allow list. Thanks.

INBK_IT

Hi @Zyxel_Jeff

We did check Content Filter profile. It says blocked by Streaming Media and Media Sharing categories, which we unchecked in both Web and DNS Content Filter. Also, we added Vimeo.com in both side trusted web sites and allow list and it is still not working. please see attached pictures for more details.

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Zyxel_Jeff

Hi @INBK_IT

It could be related to the cache issue, please perform below steps:

Step1. Enter the CLI "debug content-filter https-domain-filter cache flush" to flush the Content Filter's cache.

Step2. Clean the browser's cache and the PC's DNS cache

Step 3: Use the browser in incognito mode to access the website to see if it's working for you.

If the issue persists, please reboot your firewall and PC to ensure all caches are completely cleared..

INBK_IT

@Zyxel_Jeff

We tried all the steps you told us and we did restarted our Zyxel USG Flex 200 and my computer.

We still have problem.

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Carlsap

We have the same problem here on a flex700 device.
Can we disable the SSL check feature?

INBK_IT

@Carlsap

Are you having problem with all streaming media? or are you trying for specific website?

INBK_IT

@Zyxel_Jeff

We still have problem. Do you have any other suggestion?

Zyxel_Jeff

Dear @INBK_IT

Could you provide a remote Web-GUI link to us for further checking purposes? I will send a private to you later, please check your inbox. Thanks.

Zyxel_Jeff

We found that the root cause is related to the DNS servers' (192.170.X.X) cache. We suggest you clean the DNS servers' cache and can resolve this problem.

We tried to nslookup youtube via Google DNS server 8.8.8.8 and can be resolved normally, but if nslookup youtube via the DNS server 192.170.X.X would be failed. Thanks.