Unable to access specific URL since changing TalkTalk router

[WayneMar1970]

TalkTalk swapped out my Router for the TalkTalk Wi-Fi Hub a few weeks ago and since then I have found that a specific set of URL's that work fine when I'm in the office are no longer accessible (Page not found) when Working from Home. 
I have various bookmarked links but the common denominator appears to be a failure to access the Dassault Systemes login page for  3D Experience ( https://eu1.iam.3dexperience.3ds.com/login?service=https%3A%2F%2Fwww.3ds.com%2F ). Is there anything special in this URL that would be blocked in my Router and if so how do I resolve it? 

Wayne 

[Karl-TalkTalk]

Hi

The router itself should not block a specific url, so I don't think this will specifically be the router.  Have you tested the links on other devices connected to your router, mobile etc ?

Thanks  

Karl. 

[WayneMar1970]

Hi Karl, 

Just checked and KId Safe is off and nothing else is enabled under homesafe apart from Virus Alerts.

Thanks.

Wayne

[Karl-TalkTalk]

Hi

Ok, if its set to medium, then that is ok.   

If you log into My Account and check that no Home Safe settings are active as these may block the site.

I have tested from my home TalkTalk connection and can access this, although I do use Google DNS.

Karl.

[WayneMar1970]

Hi Karl, 

Thanks for the quick reply. It appears to be set as medium as below..  I temporarily set to low just to test, but I saw the same result.  
Firewall

[Karl-TalkTalk]

HI

can you log into the router and check that the firewall level is set to medium (default).

In a handful of cases we found that a recent update had caused this to be set incorrectly to high, so this is the first option to check.

Thanks  

Karl.