Using a Mac with a proxy server

Hi I’m very new to Macs to apologies if this is a really silly question. I’m
trying to setup a Mac on our network and I’m having an issue getting it to work
properly with our proxy server. I have connected the Mac to the network and
selected automatic proxy configuration in the network settings using the URL of
our Pac file. I am asked for a proxy username and password when I initially try and
access a website but once I have entered my credentials they are saved in
keychain and anyone coming after me can browse using my account. I work in a
hospital so there are many different people accessing different devices. We
monitor and trace all users internet browsing so my question is can I configure
the Mac to ask for proxy credentials for different users? On our windows devices
a login box will appear if the browser has been closed and reopened. Can I do
this with the Mac?????
Any help you can offer will be very much appreciated.
Thanks

Do NOT store the proxy server username and password in Keychain.
Easy to say, but by default, the next person to enter their password is likely to store their username password in the Keychain.
You can use Applications -> Utilities -> Keychain Access to give the Keychain a separate password and to auto-lock it after 'n' minutes. If you are the only one to know the Keychain password, then no one will be able to add the Proxy server username/password to the keychain.
Keychain Access -> Edit -> Change Settings for Keychain Login...
Keychain Access -> Edit -> Change Password for Keychain Login... (this is NOT required; you can keep the keychain set to use the same password you use for your login, as long as no one else knows that password; changing the settings to lock the keychain is sufficient for your needs)
The good news is that only you will be able to access stuff stored in the Keychain. The bad news is that if you do need stuff in the Keychain, you will need to enter the keychain password everytime you need to get at them.

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Hi I’m very new to Macs to apologies if this is a really silly question. I’m
trying to setup a Mac on our network and I’m having an issue getting it to work
properly with our proxy server. I have connected the Mac to the network and
selected automatic proxy configuration in the network settings using the URL of
our Pac file. I am asked for a proxy username and password when I initially try and
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Any help you can offer will be very much appreciated.
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