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Outbound Ports Blocked




The following outbound ports, are being blocked, on the servers hosted at Site Ox.  If you have a legitimate business need for any of the ports listed, please open a support ticket.


Port

Transport

Protocol

Inbound/

Outbound

Reason for block

25

TCP

SMTP

Both

Port 25 is unsecured, and Botnet spammers can use it to send spam.

68

UDP

BOOTP, DHCP

Both

UDP Port 68, which is used to obtain dynamic Internet Protocol (IP) address information from our dynamic host configuration protocol (DHCP) server, is vulnerable to malicious hacks.

135-139

TCP/UDP

NetBios

Both

NetBios services allow file sharing over networks. When   improperly configured, ports 135-139 can expose critical system files or give   full file system access (run, delete, copy) to any malicious intruder connected to the network.

161-162

TCP/UDP

SNMP

Both

SNMP is vulnerable to reflected amplification distributed denial of service (DDoS) attacks.

445

TCP

MS-DS, SMB

Both

Port 445 is vulnerable to attacks, exploits and malware such as the Sasser and Nimda worms.

520

TCP/UDP

RIP

Both

Port 520 is vulnerable to malicious route updates, which   provides several attack possibilities.

1080

TCP

SOCKS

Both

Port 1080 is vulnerable to, among others, viruses, worms and DoS attacks.



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