Connectivity state denied with both old and a new arris SB8200

That's way out of spec ! Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.

Procedure  Status  Comment
Acquire Downstream Channel  579000000 Hz  Locked
Connectivity State  In Progress  Access Denied
Boot State  In Progress  Unknown
Configuration File  OK  
Security  Failed  BPI+
DOCSIS Network Access Enabled  Denied  

Downstream Bonded Channels
Channel ID  Lock Status  Modulation  Frequency  Power  SNR/MER  Corrected  Uncorrectables
29  Locked  QAM256  579000000 Hz  1.7 dBmV  42.2 dB  0  0

Upstream Bonded Channels
Channel  Channel ID  Lock Status  US Channel Type  Frequency  Width  Power
1  9  Locked  SC-QAM Upstream  35600000 Hz  6400000 Hz  59.0 dBmV

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

Also. Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home. And if the problem is found to be on their side of the demarcation point, there will not be any charge.

Good luck !