Users from one location attempting to access a website receive the network error:

"Operation Timed Out - tcp_error,"  only for a specific data pod.  Other data pods reach the website without an error.

When you pull a report from the WSS portal, it shows Error 503 in the status.

Network Error
A communication error occurred:
"Operation timed out".
The web server may be down, too busy, or experiencing other problems preventing it from responding to requests.
Tech support information: tcp_error

The specific website has blocked the WSS data center Egress IP.

Request the website to allow all Egress IP's from all WSS data centers or those that are closest to the location that needs access to that particular website.

See:

• Egress IP addresses for Web Security Services for the Americas
• Egress IP addresses for Web Security Services for the APAC
• Egress IP addresses for Web Security Services for the EMEA

• https://www.iplocation.net/ 
• https://www.maxmind.com/en/geoip-demo