Disconnections from VPN and Chrome refusing to load pages

Cross post from stackexchange

I have a VPN I use for work with L2TP config. The same VPN works smoothly without any issue in a Windows laptop. However, it drives me crazy in my iMac with two issues.

• We have a few websites from work that are only accessible through VPN. Chrome refuses to open those sites and I get instantly an error of 'ERR_NAME_NOT_RESOLVED'. I get this more than 2 days now. I tried to flush DNS and reset my router, but still. The same websites are accessible with Safari, but it is super slow and not reliable. Direct access on ftp or database works without an issue.

• There are days that I get disruptions on VPN. Specifically, I have it with disabled the option of getting all traffic through the VPN. But, in those days, when I try to open any website (no work related), it keeps loading and loading until I get disconnected from the VPN and then suddenly the page loads. I might get a disconnection every 2-3 minutes.

I want to focus that at the same time, Windows laptop works great with it, and our IT department cannot see anything strange in their side.

I have an iMac with Sequoia 15.0. The first problem appeared after upgrading to 15.0. The second one has been there for months.