connectivity within Comcast

Hello MBladmin and welcome,

Could you share more specific information by your " but multiple users with Comcast home connections cannot reach the office " i.e. do you mean:

 1. your Comcast business website access or specify what facility you are referring to?

 2. by " get DNS but cannot connect -or even ping " i.e. ping your Modem, static IP device?

 2. are you using a Comcast static IP?

 3. What Comcast modem are you using for your business connect?

Please shre some addtional information so we can assist you further. Thanks

The office hosts several services - https, PPTP, VNC et. al. - on a Comcast provided static IP - 173.163.35.xx

The home users of Comcast on xfinity currenlt get IPs (DHCPd) of 75.75.171.xx and 75.75.168.xx respectively.

Each of those two users can ping each other but cannot ping (or otherwise connect https: or vnc or vpn) the office.

Tracerts timeout at 75.75.168.1

When I say 'get DNS' I mean if if ping themachine.theoffice.com it successfully retrieves the office address of 173.163.35.xx but no ping response.

That office 173.163.35.xx address is pingable (and connectable in the ways described above) from other Comcast Business locations (in that same 173 address range) and from outside ISPs including Verizon and others.

I do not know the model of the equipment at any of the locations. generally older installs. All worked fine thru last Thursday. Have been volleyed from xfinity to comcast business to 'the security team' (Comcast xfinity support suggests security is blocking the site - though could not tell me if that would block both business and residential Comcast customers from reaching the site).