How does Gmail recognize me under proxy?

I successfully created a few Gmail accounts changing the proxies through Firefox, after the 3rd account and third proxy, as I am using a separate proxy for each Gmail account, Gmail starts asking for phone verification. If I am under proxy how does Gmail know or why would they make me verify the fourth account on a 4th proxy. Is there something that lets Gmail know even though I am using a proxy that I am the same user? The computer itself or something? I downloaded Firefox with no information saved about me either which should make it different. All the proxies do have the same port if that is the reason why not sure? And some proxies have the same numbers but the last two or three are different after the last "."

Anyone able to shed some light or give any pointers on how to go stealthier with this?

It is a basic web protection for some sites. It will be a shame for them if they don't know to see this.

misteryou. said:

It is a basic web protection for some sites. It will be a shame for them if they don't know to see this.

Click to expand...

Can you clarify what you are referring to exactly? What is the basic web protection?
Thanks.

If your proxies aren't SOCKS proxies they might not be as anonymous as you think. Google SOCKS versus HTTP proxies to learn more.

I wouldnt hold it past Google to use canvas fingerprinting to identify the client side computer despite the network connection used.

keep in mind AdSense only works if Google has solved this problem. So odds are Google has solved this problem in some form.

also if your proxies are shared then Google likely knows they are proxies.

clear your cookies and cache between new accounts... A cached include can revive your old session if you aren't clearing the cache and local storage too

autocomplete and password manager might be narc-Ing on you. You might need to clear saved passwords too.

google uses persistant cookies like evercookie, basicaly it means that the cookie copies itself and spreads out sort of like a virus, using a oersistant cookie also meens that simply clering your cache and cookies will not help becouse again it is selfreplicating.
you can get rid of at least most persistant cookies but it does involve a few more steps.

Use CCleaner in between accounts. Also make sure you`re not connected to anything else in that browser during that session because in some cases google might link that account to your gmail account. If that also doesnt work and the proxies are not the problem, try spoofing your MAC address.
Not 100% sure about that last part

validseo thanks for pointing canvas fingerprinting.. didn't know about this but now I explain myself many things in the past...

Nice knowledgeable answer there!

validseo said:

If your proxies aren't SOCKS proxies they might not be as anonymous as you think. Google SOCKS versus HTTP proxies to learn more.

I wouldnt hold it past Google to use canvas fingerprinting to identify the client side computer despite the network connection used.

keep in mind AdSense only works if Google has solved this problem. So odds are Google has solved this problem in some form.

also if your proxies are shared then Google likely knows they are proxies.

clear your cookies and cache between new accounts... A cached include can revive your old session if you aren't clearing the cache and local storage too

autocomplete and password manager might be narc-Ing on you. You might need to clear saved passwords too.

Click to expand...