To anyone ending up here, the problem is recent openVPN android client changes, see https://community.tp-link.com/en/business/forum/topic/653224?replyId=1315982 thanks operVPN..

Update: I just tried disabling the ACLs temporarily and the result is the same. So I really doubt there is anything to do with ACLs

The setup I have 3 VLANs A: 192.168.20.0/24 B: 192.168.40.0/24 C: 192.168.100.0/24 This enforced in a router ER605 v2.0. This router also acts as VPN server: I have some ACLs that block traffic from...