I have two sites A and B with a 2765 router at each site and a site to site VPN working fine. Users at both sites can see resources at both sites.

I also have a number of remote users who are VPN'ing in to access servers at one or the other site.

Currently if a user remotes into site A they cannot ping resources at site B even though there is a site to site VPN between sites A and B

Is this behaviour expected? Is there a way to add a route for remote VPN users connecting to site B so they can see resources at site A?

If there are additional ip ranges available through the VPN, you will need to add those in the "More" section of the lan to lan VPN profile, for the clients on both sides to be able to use the extra subnets.

If the inaccessible addresses within the /24 range of the subnet the VPN is using to dial, it could be down to things like Windows Firewall.