Mayo Health Clinic Employees are not able to reach https://genome.ucsc.edu

[Foltz, Benjamin K.]

Hello,

This is Benjamin Foltz with the Zscaler Team for Mayo Health Clinic. Starting today, remote employees on Zscaler have lost access to https://genome.ucsc.edu/ despite no changes to policy on our end, this was working as expected yesterday.

This is working for users that are on-campus and using the Mayo public IP range, whereas users that are remote will use a Zscaler virtual IP and are not able to connect to the site.

For example, a user on Zscaler attempted to reach the page from the IP: 165.225.60.18 and the site blocked access.

I'd just like to confirm if there are IP restrictions for access to this site?

Best regards,

Benjamin Foltz

Junior SASE Specialist

[Gerardo Perez]

Hello, Benjamin.

Thank you for using the UCSC Genome Browser and for reporting your issue.

This issue has been resolved, and the site should be operating normally. We apologize for any inconvenience this may have caused. Let us know if you experience any further issues or have any questions.

Gerardo Perez
UCSC Genomics Institute

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[Gerardo Perez]

Hello, Benjamin.

We had an unplanned outage related to maintenance early this morning that caused a disruption with some connections to ucsc.edu. I am CC'ing the UCSC campus IT Security on this email so they can share more details on what was done to remediate the issue.

Gerardo Perez
UCSC Genomics Institute

On Thu, Jun 18, 2026 at 10:02 AM Foltz, Benjamin K. <Foltz.B...@mayo.edu> wrote:

Hi Gerardo,

Could you shed some light onto what the issue on your end was and what was done to remediate it?

We rolled out a fix that anchored the Mayo public IP range to outbound traffic to the site. After rolling that out, the site was accessible for Mayo remote users.

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From: Gerardo Perez <gpe...@ucsc.edu>
Sent: Thursday, June 18, 2026 12:12 PM
To: Foltz, Benjamin K. <Foltz.B...@mayo.edu>
Cc: gen...@soe.ucsc.edu <gen...@soe.ucsc.edu>; Hein, Molly S. <Hein....@mayo.edu>
Subject: [EXTERNAL] Re: [genome] Mayo Health Clinic Employees are not able to reach https://genome.ucsc.edu

External Email Notice: This message was sent by someone outside Mayo Clinic.

[Foltz, Benjamin K.]

Hi Gerardo,

Could you shed some light onto what the issue on your end was and what was done to remediate it?

We rolled out a fix that anchored the Mayo public IP range to outbound traffic to the site. After rolling that out, the site was accessible for Mayo remote users.

---

From: Gerardo Perez <gpe...@ucsc.edu>
Sent: Thursday, June 18, 2026 12:12 PM
To: Foltz, Benjamin K. <Foltz.B...@mayo.edu>
Cc: gen...@soe.ucsc.edu <gen...@soe.ucsc.edu>; Hein, Molly S. <Hein....@mayo.edu>
Subject: [EXTERNAL] Re: [genome] Mayo Health Clinic Employees are not able to reach https://genome.ucsc.edu

External Email Notice: This message was sent by someone outside Mayo Clinic.