My environment was working this morning, until I renewed my License. Now I am getting the "ID4037: The key needed to verify the signature could not be resolved from the following security key identifier 'SecurityKeyIdentifier" error when users try to login to the Web Client. Access via the Laserfiche client is still working as expected.
Webclient version looks like 10.4.2u3 based on the install files, but I don't see where to identify the exact version in any of the tools. And I can't login to the Web Client Configuration site, I have the same issue as logging into the Web Client.
I've checked the client.config file (suggested in a previous Answer), and don't see any issues (server names are all using FQDN).
The only change was renewing the license, the Web Client stopped immediately after renewing the license, so I'm wondering if there is a step there that I'm missing.