Does Salesforce IP session locking impact FinDock?

The short answer is YES. Here's why...

Salesforce security settings include a range of Session Settings to help harden org security. One method is to lock authorized connections to a specific IP address. This is enabled with the Lock sessions to the IP address from which they originated setting.

danger

Key FinDock functionality will silently fail if you enable IP session locking.

FinDock uses a service architecture that leverages dynamic IP addressing. PSP notification handling and FinDock Giving Pages, for instance, rely on tokenization across multiple IP addresses. If sessions are locked to a specific IP, incoming notifications get stuck (and don't arrive in Salesforce). Redirecting and similar aspects of Giving Pages will also fail.