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Internet Access Restrictions
Johns Hopkins University and Medical Institutions

The following IANA registered protocols are supported through the Johns Hopkins University and Medical Institutions perimeter firewalls. Other services may work, but are not supported and may be discontinued at any time.

  • FTP - Passive & Active
  • telnet
  • ssh
  • http - on standard ports
  • pop3
  • nntp (usenet)
  • ntp
  • imap4
  • Netmeeting
  • Timbuktu
  • https
  • klogin
  • kshell
  • Appleshare IP
  • Quicktime/RTSP
  • Filemaker Pro
  • SQLNet
  • Groupwise
  • h323
  • eklogin
  • CVS
  • PCAnywhere
  • Netscape Enterprise Calendaring
  • Quicktime/RTP
  • RealMedia


Questions about the perimeter security restrictions should be sent to issues@jhu.edu


The Enterprise Network Architecture & Design group is primarily responsible for providing enterprise-wide local (LAN), wide (WAN), and metropolitan (MAN) area network support for the Johns Hopkins Institutions. These data network infrastructures are fundamental to the success of the medical, instructional and research missions of the Johns Hopkins Institutions.

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