This is the error I receive from the UPS module when I get to the shipping selection screen of the check out process.

"We are unable to obtain a rate quote for UPS shipping.
Please contact the store if no other alternative is shown."

My Zen-Cart version is: v1.3.9d

My settings for the UPS module are:

United Parcel Service

Enable UPS Shipping
True

UPS Pickup Method
CC

UPS Packaging?
CP

Residential Delivery?
RES

Handling Fee
0

Handling Per Order or Per Box
Box

Tax Class
--none--

Tax Basis
Shipping

Shipping Zone
--none--

Sort order of display.
0

Shipping Methods:
Nxt AM, Nxt AM Ltr, Nxt, Nxt Ltr, Nxt PR, Nxt Save, Nxt Save Ltr, 2nd AM, 2nd AM Ltr, 2nd, 2nd Ltr, 3 Day Select, Ground, Canada,World Xp, World Xp Ltr, World Xp Plus, World Xp Plus Ltr, World Expedite, WorldWideSaver
1DM, 1DML, 1DA, 1DAL, 1DAPI, 1DP, 1DPL, 2DM, 2DML, 2DA, 2DAL, 3DS, GND, STD, XPR, XPRL, XDM, XDML, XPD, WXS