I am getting error message: A security error occurred

Server, Publisher, Distributer is the same comp. Win 2003, IIS 6, SQL 2005 Standard. Dont have static IP yet, using no-ip service.
Tried security certificate using selfSSL, got error, tried thwart trial certificate valid for 20 days, still gives warning on subscriber. added publisher cert to "Trusted Publishers" & warning stopped on subscriber (tried 3 browsers IE, MozFF, Gogl Chrome all ok). but warning still shows on any other computer.

Diagnostic shows success. https://ace.no-ip.biz/websync/replisapi.dll?diag

Subscriber connects over web, uses Internet connection sharing through another computer on LAN. ()
Detailed Error (Names are similar)

2008-10-16 14:56:25.561 Connecting to Subscriber 'S1'
2008-10-16 14:56:26.168 The upload message to be sent to Publisher 'SERVER\SQL' is being generated
2008-10-16 14:56:26.184 The merge process is using Exchange ID '1D328F93-3ADA-4BED-AD70-9A76A59BA77C' for this web synchronization session.
2008-10-16 14:56:58.322 A security error occurred

2008-10-16 14:56:59.864 Category:NULL
Source:  Merge Process
Number:  -2147209329
Message: A security error occurred

2008-10-16 14:56:59.864 Category:NULL
Source:  Merge Process(Web Sync Client)
Number:  -2147010889
Message: The Merge Agent could not connect to the URL 'https://ace.no-ip.biz/websync/replisapi.dll' during Web synchronization. Please verify that the URL, Internet login credentials and proxy server settings are correct and that the Web server is reachable.

I have spent many days strugling. Please help.