Home IP Blocks and Why You May Not Be Able to Access the UC San Diego Network


With many more people working from home, we have much more remote access to file servers, remote desktops, remote applications or remote database connectivity. As such our network is more exposed than ever.

Therefore, the network security team constantly runs a series of automated processes to monitor our network for behavior that is, or appears to be, malicious. From time to time, users may have their home IP address blocked if malicious activity is detected or suspected.

This is called a home IP block or a border block.

Critical Concepts

Common Causes of IP/Border Blocks

Here are some examples of what can cause an IP to be blocked, as well as some best practices to avoid being blocked.

These are just a few scenarios that can and have occurred that resulted in an IP address being blocked.

If you have been blocked more than once, note when, and what activity you were doing and how you are doing it. Identifying a pattern like that may lead to a resolution.

We are always vigilant, and you should be too.

We would encourage you to work with your IT support team to make sure your home computers are running anti-virus solutions and that the resources you need on the UC San Diego network are accessible in a safe and secure manner.

Steps to Take

  1. Run a security scan on your computer. If you do not have an antivirus software to run this scan, you may want to use Malwarebytes which provides a free version to run malware scans. 
    • If you are unable to run a scan on your computer, contact the Service Desk at support@ucsd.edu 
  2. If the scan pulls up a malware, remove the malware and run the scan one more time. 
  3. Once the scan comes back clear, take a screenshot of the scan. 
  4. Find the IP of your computer. You can do so by following the instructions here.
  5. Submit a ticket to support@ucsd.edu and include both your IP address and the screenshot of your scan. 

If you still have questions or need additional assistance, please contact the ITS Service Desk. You can call us at (858) 246-4357, email us at support@ucsd.edu, or submit a ticket at support.ucsd.edu.