Firewall and Proxy Settings

Connections to OSC

In order for users to access OSC resources through the web your firewall rules should allow for connections to the following publicly-facing IP ranges.  Otherwise, users may be blocked or denied access to our services.

• 192.148.248.0/24
• 192.148.247.0/24
• 192.157.5.0/25

The followingg TCP ports should be opened:

• 80 (HTTP)
• 443 (HTTPS)
• 22 (SSH)

The following domain should be allowed:

• *.osc.edu

Users may follow the instructions below "Test your configuration" to ensure that your system is not blocked from accessing our services. If you are still unsure of whether their network is blocking theses hosts or ports should contact their local IT administrator.

Test your configuration

[Windows] Test your connection using PuTTY

1. Open the PuTTY application.
2. Enter IP address listed in "Connections to OSC" in the "Host Name" field.
3. Enter 22 in the "Port" field.
4. Click the 'Telnet' radio button under "Connection Type".
5. Click "Open" to test the connection.
6. Confirm the response. If the connection is successful, you will see a message that says "SSH-2.0-OpenSSH_5.3", as shown below. If you receive a PuTTY error, consult your system administrator for network access troubleshooting.

[OSX/Linux] Test your configuration using telnet

1. Open a terminal.
2. Type telnet IPaddress 22 (Here, IPaddress is IP address listed in "Connections to OSC").
3. Confirm the connection. 

Connections from OSC

All outbound network traffic from all of OSC's compute nodes are routed through a network address translation host (NAT) including the following IPs:

• 192.148.249.248
• 192.148.249.249
• 192.148.249.250
• 192.148.249.251

IT and Network Administrators

Please use the above information in order to assit users in acessing our resources.  

Occasionally new services may be stood up using hosts and ports not described here.  If you believe our list needs correcting please let us know at oschelp@osc.edu.