TISD Online Knowledge Base

A reference resource for TISD customers

Welcome to the TISD Online Knowledge Base.

This site contains information about how to troubleshoot common issues as a TISD customer, and how to set up common email clients and Internet connection services we offer.


If you have a suggestion for content, or do not see a walkthrough available for a topic, please feel free to send an email to for review.



For billing or sales inquiries, call 361-573-1102 Option 1

Billing hours of operation are:
Monday - Friday 8:00 AM to 5:00 PM*
Saturday & Sunday [Closed]


For technical support, call 361-573-1102 Option 2
You can also send an email to for support as well.

Technical Support hours of operation are:
Monday - Friday 8:00 AM to 6:00 PM
Saturday 9:00 AM to 3:00 PM*
Sunday [Closed]


Neither department closes for the lunch hour.
*If you call after 5:00 PM or 3:00 PM on Saturday, and do not use the technical support extension, your call will not be responded to until billing resumes operations.