Visitor
•
5 Messages
Connection drops T3 and T4 timeouts
Hello,
Since the start of August I have had many service issues with my Xfinity internet.
I own my own cable modem.
The modem upstream power looks like its maxed out almost and that is when the connection drops as I see in the modem logs T3 and T4 timeouts.
Issue: Internet connection T3 timeouts and T4. Modem restarts.
DOCSIS 3.0
Logs
Tue Aug 18 10:05:01 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;
CM-MAC=xxxxxxxxxx ;CMTS-MAC=XXXXXXXXXXXXXXx ;CM-QOS=1.1;CM-VER=3.0;
Tue Aug 18 10:06:14 2026 Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast
Maintenance opportunities received - T4 time out;
CM-MAC=xxxxxxxxxx;CMTS-MAC=xxxxxxx;CM-QOS=1.1;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Tue Aug 18 10:12:39 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;
CM-MAC=xxxxxxxx;CMTS-MAC=xxxxxx;CM QOS=1.1;CM-VER=3.0;
Tue Aug 18 10:13:44 2026 Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast
Maintenance opportunities received - T4 time out;
CM-MAC=xxxxxxx;CMTS-MAC=xxxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;
Tue Aug 18 11:44:19 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;
CM-MAC=xxxxxx;CMTS-MAC=xxxxCM- QOS=1.1;CM-VER=3.0;
Time Not Established Critical (3) No Ranging Response received - T3 time-out
Wed Aug 19 08:47:58 2026 Critical (3)
Started Unicast Maintenance Ranging - No Response received - T3 time-out;
CM-MAC=xxxxxxx;CMTS-MAC=xxxxxxx ;CM- QOS=1.1;CM-VER=3.0;
All my coax cables are wrench tight. I have swapped out wires from the wall to the modem.
I live in an apartment complex.
There appears to be others having issues in the area also as last week I received a few messages that Xfinity that they 'notified issues and were doing maintenance.
Then I got a message saying I could request a tech.
So I requested on for later in the week but by then the issue seemed to go away so I opted to cancel the appointment via the automatized system.
Back at it again this week with issues....
This seems to a chronic problem for the area with what I would think is many band aids based on other things I see happening
with the Xfinity trucks in the area.
Can I get some assistance for myself and the others in this complex?
XfinityFrank
Official Employee
•
2.6K Messages
9 hours ago
Hi there, @user_wizman. Thanks for reaching out to us here on the Community Forum and sorry to hear about the connection issues. Sounds like you've already done all the troubleshooting that we would ask of you. I would be interested to check out the RF signal with our tools and if needed, get that tech rescheduled for you.
Please send a direct message to us including your full name and complete street address.
Here's the detailed steps to direct message us:
1-Click "Sign In" if necessary.
2-Click the "Direct Messaging" icon.
3-Click the "Start new conversation" (pencil and paper) icon.
4-In the "To:" line, type "Xfinity Support".
5-As you type, a drop-down list will appear. Select "Xfinity Support" from that list.
6-An "Xfinity Support" graphic will replace the "To:" line.
7-Type your message in the text area near the bottom of the window.
8-Press Enter to send it.
How to: Direct messaging within the forum
0
0