Hi Amos. Thanks for your reply. Squid Cache: Version 3.4.8 On: Linux version 3.16.0-4-amd64 (debian-kernel at lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.7-ckt9-3~deb8u1 (2015-04-24) Maybe a known and solved bug? Athos Fiolo Software Engineer afiolo at came.com CAME S.p.A.