permissions problem while reading log file

[Abhishek Dixit]

I want to read a log file to see if squid-deb-proxy server is running or
not  so I do
tail: cannot open `squid-deb-proxy/access.log' for reading: Permission
denied

 tail -f squid-deb-proxy/access.log
hence

I am tried to change permissions of a folder temporarily whose initial
permissions are

user at ubuntu:/var/log$ ls -l squid*
squid3:
total 4
-rw-r----- 1 proxy proxy    0 Jan 16 14:43 access.log
-rw-r----- 1 proxy proxy 1359 Jan 16 14:43 cache.log
ls: cannot open directory squid-deb-proxy: Permission denied

to some thing following

user at ubuntu:/var/log$ sudo chmod -R 644 squid*
user at ubuntu:/var/log$ ls -l squid*
squid3:
ls: cannot access squid3/cache.log: Permission denied
ls: cannot access squid3/access.log: Permission denied
total 0
-????????? ? ? ? ?            ? access.log
-????????? ? ? ? ?            ? cache.log

squid-deb-proxy:
ls: cannot access squid-deb-proxy/store.log: Permission denied
ls: cannot access squid-deb-proxy/cache.log: Permission denied
ls: cannot access squid-deb-proxy/access.log: Permission denied
total 0
-????????? ? ? ? ?            ? access.log
-????????? ? ? ? ?            ? cache.log
-????????? ? ? ? ?            ? store.log

If you notice after the change of permission there is question mark every
where.Why is it happening so?

I basically want to read the access log to see if squid-deb-proxy server is
getting requests from client or not. How can I read the log in this case.

I am doing so on Ubuntu 12.04

-- 
-------------------------

Abhi
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