If in case you face any issue while accessing the URL then you can also use the default IP address 192.168.1.1 or 192.168.0.1 instead of Web URL as this will also redirect you to the login page. If still issue persist then you can try with changing your web browser once, for example you can close your google chrome and can try with Firefox or Internet explorer.
http://tplinkmodemsetup.net/
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