The remote host is vulnerable to a Denial of Service (DoS) attack
According to its banner, the version of the Squid proxy caching server installed on the remote host is older than 3.0.STABLE17 or 18.104.22.168. Such versions reportedly use incorrect bounds checking when processing some requests or responses. Squid-2.x releases are not vulnerable.
Either upgrade to Squid version 3.0.STABLE17 or 22.214.171.124 or later or apply the patch referenced in the project's advisory above.