An existing site running CT 2.5 and EE 2.7.3 with SagePay (server) has suddenly stopped working on the LIVE server.
Initially I thought it might be due to the recent SagePay API update to v3.0, so I have updated the gateway files provided by the new owners Vector Media Group but still no luck.
The error presented is as follows: "4020 : Information received from an Invalid IP address."
Previously this was working so I know the valid IP's were setup and were ok, so I'm not sure why else this error would be present?
Also, this error appears before getting onto the SagePay server, after submitting the checkout form to go to SagePay it stops and this error shows up.
Any ideas anyone please, I'm stumped at the moment?
To start with I'm looking for ideas without having to update both EE and CT please! Thanks in advance.