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Network: Blocked Internet Ports

Purdue University and the Engineering Computer Network block certain TCP or UDP service ports coming into the university from the external Internet. These blocks are implemented on the gateway routers as a method of enhancing security -- by blocking a portion of network traffic from external sources.

Blocks are done on individual services by port number (a number between 1 and 65535) and by protocol type (either TCP or UDP or both). Also, the scope of the blocked ports may be either "All Purdue" (blocked completely) or "ECN Only" (blocked to the 128.46.0.0/16 network).

The following table lists all blocked services as of July 30, 2010.

Service Name Port Number Protocol Scope In/Out
snmp 161 UDP All Purdue In
snmptrap 162 UDP All Purdue In
netbios 135 TCP/UDP All Purdue In/Out
netbios-ns 137 TCP/UDP All Purdue In/Out
netbios-dgm 138 TCP/UDP All Purdue In/Out
netbios-ssn 139 TCP/UDP All Purdue In/Out
netbios 445 TCP/UDP All Purdue In/Out
netbios 593 TCP/UDP All Purdue In/Out
mssql 1433 TCP/UDP All Purdue In/Out
mssql 1434 TCP/UDP All Purdue In/Out
rdp 3389 TCP/UDP All Purdue In
X Windows 6000 TCP All Purdue In
bootps 67 UDP ECN Only In
tftp 69 UDP ECN Only In
sunrpc 111 TCP/UDP ECN Only In
ntp 123 UDP ECN Only In
exec 512 TCP/UDP ECN Only In
cmd 514 TCP ECN Only In
syslog 514 UDP ECN Only In
lpd 515 TCP ECN Only In
flexlm 744 TCP ECN Only In
oracle 1521 TCP ECN Only - except 128.46.20.47 and 128.46.20.53 In
orasrv 1525 TCP ECN Only In
nfsd 2049 TCP/UDP ECN Only In
lockd 4045 TCP/UDP ECN Only In
omni 5555 TCP ECN Only In
dtspc 6112 TCP ECN Only In

 

Last Modified: Jun 14, 2017 2:07 pm America/New_York
Created: Oct 8, 2007 9:20 am GMT-4 by admin
JumpURL: https://eng.purdue.edu/jump/98a63