I think that may explain your issue. IIRC, AnyConnect captures all traffic, and sends it through the VPN, resulting in it not being able to connect. Other issues related to AnyConnect can be found here; #9434. I don't think this is a bug in docker, or anything we can do to resolve...
but I keep having a notification popping up whenever I open a new tab on google chrome and search for a website. The notification says that the website is blocked due to riskware, even though I'm pretty sure the website I'm browsing are 100% safe. ...