HTTP 500 Error with OWA on exchange 2003 – Windows Server 2003 SP2 for SBS

Our organization has never used OWA before but we identified a need for off-site email replication. I used the internet connection wizard to set up the OWA interface as suggested and it worked internally for a while. It has since stopped working correctly.

Currently, users can reach the web interface but as soon as you try to log in, the server throws a HTTP 500 error. I can’t find any other resources to help with this and we’re really looking to resolve the issue soon. Does anyone have a solution?