WAF 340001
From Atomicorp Wiki
Rule ID: 340001
Alert Message: Atomicorp.com WAF Rules: Dis-allowed Transfer Encoding - modsecurity does not support this encoding and can not detect attacks using it, therefore it is blocked.
Description: modsecurity, the WAF used, does not support Transfer Encoding, therefore it can not see or evaluate any traffic encoded in this manner. If an attack were to be encoded in this way the WAF would not catch it, therefore the WAF is configured to block this traffic.