The Edge Encryption rules have failed validation with respect to syntax, signature, or deletion. 

The proxy keeps a local copy of the Edge Encryption rules in the encryptionconfiguration.json file and in the /rules folder (London and earlier) or /cache folder (Madrid and later) on the proxy.  The error occurs if there is a rules mismatch between the instance and the proxy.

If there is a validation problem, the trust is broken and the proxy only trusts its local copies until recovery.

Remove the rules-related files from the proxy and obtain them from the instance.  Repeat this for each proxy on the instance, one proxy at a time.

1. If the proxy is already running shut it down.
2. On the Edge Encryption proxy server machine, go to the directory proxy_installation_location/conf.
3. Remove or rename the encryptionconfiguration.json file.
4. Go to proxy_installation_location/rules. (or proxy_installation_location/cache in Madrid and newer)
5. Remove all of the rule related files in this /rules or /cache directory.
6. For example, the files in the /rules || /cache directory will usually be:
   1. encryptionGetRules.js
   2. encryptionPostRules.js
   3. getRulesSysIds
   4. postRulesSysIds
7. Start the proxy again.
8. The rules-related error should be gone, and a new encryptionconfiguration.json file and new files should be created in the /rules || /cache folder from the instance