USB 760 Sign-in / First connect error QA901 (RAS-Error 721)

[arilou]

VZAccessManager finds Verizon Network (good signal strength). Chain:

1. Selecting "Verizon Wireless-VZAccess", clicking on "Connect WWAN"

button, then "Sign-up"
2. window "initialize your device"
3. window "updating your device"
3.1 window "another atempt to updating your device will start in x

seconds"
4. Attempt 2 of 2 "updating your device"
5. window "Connecting..."
6. window "Authenticating"

then error message:

"VZAccess is unable to connect at this time. Please try connecting again

later. Error QA901"

Clicking "OK", the "Sign-Up" window reports "RAS Error 721" (means: "no

response").

I found the tip to open TCP port 1723 in Windows Firewall, and it's the

first time the usb-modem LCD is blinking! But no success.

Second try: Adding VZAccessManager.exe to list of exception-programs (Firewall).

Modem LCD does not flash anymore, VZManager reports RAS error 678 (also

means: "no response").

Again at Windows Firewall, "extended" settings, disabling Firewall for

"Mobile Broadband Self Activation" and "Verizon Wireless - VZAccess"

completely.

Blinking is back. Result:

"You are not in a Mobile Broadband coverage area. Mobile Broadband

coverage is required to sign up on-line. Please call Telesales at (800)

786-8419 to sign up for service. Error QA904"

On a second try, we're back to QA901/RAS721, though stick LED is blinking

on all stages including "Authenticating". (Last message did not come again.)

What shall I do now???