We have resolved the underlying issue causing ICAP errors for customers using DLP Cloud Detection Service for Web Security Services. This incident is now resolved.
We are aware that a small subset of customers using Symantec DLP Cloud Detection Service for Web Security Services may be experiencing ICAP errors while using the service. We are investigating this issue with the highest priority. For up to date information, please follow the incident updates here: https://wss.status.symantec.com/incidents/klpm9w037g6k