how to a site detect that i ever been there

a site that use installer to open.
once i register i must use the same ip to re-login. otherwise site refused it.
but when i try to register new account site refused it to said that i already have an account there. (note: i use same laptop)
so.. how to manipulate that make me can register new acc with same device?
thank you
ervin andreanAsked:
Who is Participating?
JohnBusiness Consultant (Owner)Commented:
If the site can determine it is you, then contact the site Support with the IP address and user name you wish to use and get them to help you straighten it out.
David FavorLinux/LXD/WordPress/Hosting SavantCommented:
Likely you're going to have many conversations with tech support for this site, because IPs change constantly.

IPs can change when DHCP leases change or an ISP can just shuffle IPs at any time for many reasons.

Anytime you connect through a cell device, chances are you IP will change at various times, depending on cell tower currently handling your connection.

VPNs randomize IPs as part of their normal function.

In general, having a site tied to an IP makes little sense these days.

Based on the comment above, I'd figure out how to contact their support via email, so you can easily contact this site every time your IP changes.

Also, likely you won't be able to use a VPN, unless you're willing to go through a discovery phase to determine the actual VPN outdrop IP being used at any given moment.

Honestly, I'd find another site offering the functionality you require, where they employ developers who better understand modern technologies, so you can avoid this nonsense altogether.
Dr. KlahnPrincipal Software EngineerCommented:
Side note: There's probably also a persistent cookie on your system's browser.  Try clearing all cookies and see if the problem persists.  But ...

Note that it may not be possible to clear this issue if you have ever allowed third party cookies on your system.  Google and other aggregators such as doubleclick track your activities across many, many sites.  Once that information is in their system it is not possible to pretend "I'm not me" because they also use other methods such as browser and display profiling to track you.
ervin andreanAuthor Commented:
its not use browser, that makes me confuse how to erase cookies
contact support?
need id proof etc etc ;(
JohnBusiness Consultant (Owner)Commented:
You need to contact the site Support to solve this, pick an IP, user name and ask them to set you up and then use that.
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