[squid-users] Wrong error page showing in browser

[Dayo Adewunmi]

Hi all

I'm trying to deny proxy access for a block of IPs during a certain time 
interval.
During that time interval when someone from that block tries to access 
the internet
they should get a customized error msg in their browser: ERR_LAB_SCHEDULE.

acl academic01 time MTWHF 08:00-18:00
acl labs src 192.168.3.19-192.168.3.200
http_access deny labs !academic01
deny_info ERR_LAB_SCHEDULE labs

However, they keep getting the default error msg, and not the customized 
one.
What am I missing here?

Thanks

Dayo