Visit 123.hp.com/setup 4520. HP printers are one of the best in the market but sometimes users may face complexities while installing the HP software. So without any stress, they should visit 123.hp.com/setup .Network problems can generally be formed due to wrong network settings, mismatching with desired printer settings, new software or driver downloaded, sometimes compatibility issues and using wrong links in the HP 4520 printer. In case, the users want any technical help, then contact HP support.