Flickr is one of the most popular photo hosting services on the Internet with thousands of photos uploaded every minute. Some companies, organizations and networks have decided to block Flickr due to its popularity to prevent their employees from accessing Flickr in those networks during work time.
There are basically two options to access Flickr if it has been blocked in the computer network or on the local computer system. The first option are proxy servers, the second an alternate url.
Proxy servers are used by millions of users a day to access websites that have been blocked in their computer networks. They are especially popular to access blocked social networking sites like Facebook or MySpace but also other popular websites like Youtube or Flickr.
Proxies tend to get banned fast by network administrators who basically need to check the traffic logs to find and ban the proxy servers used by company employees.
More interesting than using proxy servers – which can also pose a security risk if the user wants to log into Flickr – is the use of an alternate url that provides full Flickr functionality.
All that needs to be done is to replace www.flickr.com with www.flickr.mud.yahoo.com. The latter will open the same page that the default url would open and users can perform all activities on Flickr normally.

The alternate url might be blocked in some networks as well depending on the rules used to block the photo hosting sites. It will not work if the word “flickr” has been blocked in urls or page titles but it will work fine if the admins have only blocked partial urls like *.flickr.com. (via My Digital Life)
Related Articles:
Photo Hosting Site Flickr Improves Search Result PagesRetrieve Original Size Of Any Flickr Photo
Flickr Photo Downloader, Download Public Flickr Photos In Bulk
Official Flickr Photo Upload Software
Direct Thumbnail To Full Size Photo Link On Flickr
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A third way to access it would be to use an URL encryptor such as http://www.ronray.com/scripts/URL-Encryption-II.html
Had configure SQUID for Windows. I was a linux guru back in the old days until such time when SQUID was released to support Windows and an office consult me of setting up their web proxy cache I tried using this and it’s awesome. In my page I’ve put step by step configuration on Windows with scripting on squid.conf on how to block sites like streaming,porn sites and block port.