PTA tightens internet security with unregistered VPN blockage / 'We can block VPNs but we won't do it', says PTA chairman / PTA signals further VPN curbs / PTA introduces new registration portal for VPN users / PTA speaks on 'technical glitch', insists on VPN registration / Web monitoring services procured by telecos: PTA / PTA denies reports of ATM closure, telecom blackout as 'fake news' / PTA official offers yet another reason for internet woes / PTA confirms whitelisting VPNs for 'smooth and secure functioning' of IT services, businesses / Plan in works to limit VPN use: PTA chief