Can't Login???

it always helps to post what exactly you are doing and any messages you receive.

You are trying to log in using https://

but now you mention that you do not have an SSL certificate.

So that means you cannot use https://

you must login using http://

Once you get anSSL certificate AND installed let the nopCOmmrce program take care of how it switches to SSL when needed. Just make sure you turn it (use SSL) on from admin.

Login is still http:// even though you now have an SSL cert.

Thank you VERY much for your help ASP5.
...
When I remove the "s" and try to Login through http://site.com/Login.aspx it still won't load the Log In page???

Try

http://site.com

and click on the login option

It automatically redirects me to httpS://site.com/Login.aspx[i][/i]??

how can you say...

"The rest of the store seems to be working fine."

if you get the https:// when you just try the site url.

You lost me.

No, the whole site works fine via HTTP, but when I click the 'Log In' link it takes me to https://site.com/Login.aspx, which is an empty "connection lost" page??
...
Can you maybe PLEASE send me all the 'default' web.config options?
I'm pretty sure this happened after I changed some 'setting' in the Admin panel.
...
P.S. This also happens with the 'Register' link.

Check the original webconfig from the nopC dnld.

Dnld again if you do not have that and extract to a diff folder.

Compare with current and make chgs if reqd.

Ok, this is what happens now:
...
Server Error in '/' Application.
Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
</configuration>


Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
    </system.web>
</configuration>

Any idea please?
...
Should I buy SSL from my hosting provider?

are you using v1.4?  make sure ssl is set as below,  I think this should allow  your store to work if ssl is the problem.

<appSettings>
    

<add key="UseSSL" value="false" />

    <add key="SharedSSL" value="" />
    <add key="GoogleMerchantID" value="123" />
    <add key="GoogleMerchantKey" value="456" />
    <add key="GoogleEnvironment" value="Sandbox" />
    <add key="GoogleAuthenticateCallback" value="False" />
    <add key="FCKeditor:BasePath" value="~/editors/fckeditor/" />
    <add key="FCKeditor:UserFilesPath" value="~/images/" />
  </appSettings>

i had my store running happily without ssl - all that happened when i went to a secure page (using IE8) was that a certificate warning came up, it did not stop the store from working


- then, when i bought the ssl, the hosting company installed it for me and all worked fine.

You could also try unzipping nopcommerce again and upload all the untouched original files to your hosting account (might be a good idea to change the connection string to your current database ) and see if that works for you - if it does, it could be a sign that you changed something when you were editing your store.