Companyweb is not displaying from the inside

I have a fairly fresh installation on SBS2008.  The company web always displayed internally until today, the same time I was finally able to get it to be accessible via the Internet.

Here is what I have checked:

- I now cannot ping companyweb
- I can ping the host server of 10.0.0.50
- From the Internet, I can access the WSS site via https://remote.xxx:987 (I am pormopted for credentials and can get in and access WSS normally
- from the server I can access the Central administration home page, but when I try to access the Operations or Application Management tab, I get prompted for credentials and no set of credentials works
- From a client computer I cannot access the Central Administration site. I get IE cannot display this webpage, the same message I get when I try to view the CompanyWeb
- From the server I can ping Companyweb. When I browse to it in IE, I get prompted for credentials but no credentials work.

I think it may be an IIS and DNS issue, but I am not sure as I did not manually change any DNS records or change any default settings in IIS.  In troubleshooting, I added a record called clientportal and added that to the bindings for companyweb in IIS, but that did not change anything.  Any assistance in getting the CompanyWeb visible again is greatly appreciated.

Thanks