how can i activate the cache in mikrotik version 2.9.27
please and thanks for all
what cache do you mean?
you have to change ur web-proxy setting and change the value with port 8080 and then Enable ur cache .
thank u very much for answer
and i want to ask u if u can help me in this prob. 
yahoo messenger did not work in “no proxies” it just work in "firewall with no proxies"in this option the webcam and voice did not work ,if u can tell me how can i fix this problem in MT and thank u again for all.
Dose this problim happend after or before WEB PROXY setting ?
explain in detail plz .
after WEB PROXY setting and i use port 5500 & 5050 but its no result.
tell me if u have any idea about this problem .
thanx
You dont have to use this port which it related yahoo!
set the folowing in web-proxy
enabled: yes
src-address: 0.0.0.0
port: 3128 OR 8080
hostname: “proxy”
transparent-proxy: yes
parent-proxy: 0.0.0.0:0
cache-administrator: “webmaster”
max-object-size: 50000KiB
max-cache-size: unlimited
max-ram-cache-size: unlimited
Hello Ram.
Did you close your proxy, i guess thatwas what you did; you only allow ur LAN subnet and deny others.
For you to make yahoo webcam to work, you have to allow TCP/5100 in your firewall and in ur webproxy access list.
Please export you config in /ip web-proxy
test this and give me a reply.
ram please upgrade to latest RouterOS 2.9.42