Proxy server software/appliance/hardware

Hi to all!
I'm looking for a software/appliance/hardware that acts as a proxy server. I want to block access to determinate web pages for a network of 500 clients. Can you suggest me both free and pay professionl solutions?
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It is as close to low cost.
Do you have an older workstation onto which you can install Linux (centos, Ubuntu, etc.) with squid into which you could add squidguard or dansguardian, the content filters may require minimal/contribution.

Depending on your environment, this system can be configured to record access noting the user (if your users are centrally managed, their credentials would/could be passed with the request ....

There are content filter appliances as noted using a similar setup, the firm but I think they were bought out and I do not recall the new name it is operating under.

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Darshana JayathilakeSystem EngineerCommented:

these are the few of applinces. also you can browse vmware market place and find out more appliances
Hugh FraserConsultantCommented:
Just to be clear, are you looking for an outbound proxy to manage users accessing external web content, or an inbound proxy to manage external users accessing internal web content?
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chipruleAuthor Commented:
hfraser I'm looking for outbound proxy to manage internal users accessing external web sites. There are different devices, pc in windows domain and non in win domain, laptop in win domain and not in win domain, smartphone from different vendors, tablets ecc...
I want to allow only specified internet sites and block all other but not for all users. A few devices or users can going on all internet site with no restriction.
chipruleAuthor Commented:
ps. I'm searching for a "trasparent" proxy with no password or configuration on end devices (pc, laptop, smartphone ecc..)
What router do you have?

A transparent proxy will be enforcing it uniformly or are you planning on using IP based rules.

Squidguard with transparent and NTLM,,,,,.

The non domain will be prompted for login rights, or you can define a rule for non authenticating users to be categorized in a specific/restricted way.

Router wccp gre/proxy is one setup....
Hugh FraserConsultantCommented:
Sophos UTM also provides similar transparent proxy services. In addition to the usual content and malware filtering, it also allows the rules ro be grouped into policies which are applied as required. A bit easier from a management perspectin IMHO.
chipruleAuthor Commented:
arnold I'm planning policies for authenticated domain users (active directory), non ad users, smartphone and guest users with their laptop.
Certain domain users will have a total access to internet sistes without restriction, other (majority) will can access only on determinate sites, but there are lot of this aren't in domain and have a local users. Smartphones will haven't restriction and guest laptop will have a totally access to internet but with temporany password.
It would be better that smartphones and client not joined in ad do not have credential for navigate (trasparent mode I think)
What do you suggest?
You were provided with appliance/proxy options.
The difficulty you want different things. One way to achieve this is to make use of VLANs I.e. Guest systems end up on totally separate network/segment feeding through the single proxy where you have ip based rules, ntlm based auth for user logins, and a third where a user will be prompted for credentials.......
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