Blocked ports between TUnet and Internet
| Transport | Port | Protocol | Description | Direction |
|---|---|---|---|---|
| ICMP | - | ping | Echo request | from outside |
| IP protocol 41 | - | IP in IP Tunneling | IPv6-Tunneling method such as 6to4 and ISATAP | both |
| UDP,TCP | 7 | echo | Echo Service | from outside |
| UDP,TCP | 9 | discard | Discard Service | from outside |
| TCP | 25 | SMTP | Simple Mail Transfer Protocol - E-Mail-Transport | from outside *) |
| UDP,TCP | 53 | DNS | Domain Name System - Nameservice | from outside |
| UDP | 67 | BOOTPS | Boot Strap Protocol Server, DHCP | both |
| UDP | 68 | BOOTPC | Boot Strap Protocol Client, DHCP | both |
| UDP | 69 | TFTP | Trivial Filetransfer Protocol (without password) | from outside |
| UDP,TCP | 111 | ONC RPC | (Sun RPC) Portmapper (a.o. for NFS) | both |
| UDP | 123 | NTP | Network Time Protocol - Time Services | from outside |
| UDP,TCP | 135 | msrpc | Microsoft Remote Procedure Call | both |
| UDP,TCP | 136 | Profile Name Service | no longer a legitimate application | both |
| UDP,TCP | 137-139 | NETBIOS via TCP | SMB (Server Message Block) - File and printer service | both |
| UDP,TCP | 161-162 | SNMP | Net-Management | both |
| UDP,TCP | 177 | XDMCP | X Display Manager Control Protocol | both |
| UDP,TCP | 445 | Microsoft-DS | Microsoft Directory Service (SMB over IP, CIFS) - File and printer service | both |
| TCP | 512 | rexec | R-Commands (Remote Exec) | from outside |
| TCP | 513 | rlogin | R-Command (Remote Login) | from outside |
| UDP | 514 | syslog | System Logging Service | from outside |
| TCP | 514 | rsh, rcp, rdump, rrestore, rdist | R-Commands (Remote Shell, Copy, Dump, Distribution) | from outside |
| TCP | 515 | lpd | Line Printer Daemon - Printer Service | from outside |
| TCP | 540 | UUCP | Unix to Unix Copy Protocol - u.a. E-Mail-Transport | from outside |
| UDP,TCP | 623 | IPMI | IPMI Management | both |
| TCP | 1080 | SOCKS | Application proxy | from outside |
| UDP | 1434 | SSRS | SQL Server Resolution Service | both |
| UDP,TCP | 1900 | SSDP | Simple Service Discovery Protocol | from outside |
| UDP,TCP | 2049 | NFS | Network Filesystem (other ports possible) - File service | both |
| TCP | 3128 | Squid | Web-Proxy | from outside |
| UDP | 3544 | Teredo | Encapsulation of IPv6 data packets in IPv4 UDP data packets | both |
| UDP,TCP | 4045 | lockd | NFS Lock Manager - File service | both |
| UDP,TCP | 5000 | UPnP | Universal Plug and Play Service | from outside |
| UDP | 5353 | mDNS | Apple Bonjour Service | from outside |
| TCP | 6000-6063 | X11 | X Window Display Server (X-Terminal) | both |
| UDP,TCP | 9100 | PDL | Page Description Language - Printer service such as JetDirect | both |
Handling of external access to TUnet (VPN, lecture halls, WLAN):
- Outgoing traffic as shown in the table above; Port 25/TCP (for sending mail) to external mail servers is also blocked for WLAN and lecture halls.
- Traffic coming from the Internet is blocked. SSH is excluded from student workplaces at the University of Vienna due to inter-university studies.
Service Center
© TU Wien
Ticketsystem Online Portal, opens an external URL in a new window
Hotline 01 588 01 42002
help@it.tuwien.ac.at
1040 Wien, Operngasse 11, EG
The Service Center can be reached digitally from 8 a.m. to 4 p.m.
Safety and Security Measures, opens an external URL in a new window
Personal customer contact only by prior appointment, opens an external URL in a new window.
Compliance with the currently applicable COVID-19 security regulations is assumed.