Sharepoint server sometimes published redirects to HTTP

I have a MOSS 2007 sharepoint server in my organisation which is published through ISA 2006 to an External URL via HTTPS

External URL: https://sharepoint.contoso.com
Internal URL: http://Sharepoint

the ISA server publishing rule published to HTTPS and the internal site is on HTTP.

the alternate access mappings are set up as follows:

default: http://Sharepoint
extranet:  https://sharepoint.contoso.com

when you click certain links from external (for example moving between pages) , it redirects the resulting screen to http://sharepoint.contoso.com/xxxxxx

obviously this page doesnt come up - if i put in the S in the address bar it goes to the page.

any suggestions?
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Big_SteefAsked:
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Amit BhatnagarTechnology Consultant - SecurityCommented:
It would be hard to say the reason without checking the configuration of the web. app itself. Although, I would recommend extending the webapp itself on SSL and not use AAM.
What is the site name mentioned on the SharePoint rule itself. Is it the default name or the extranet?
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Big_SteefAuthor Commented:
Am in the process of migrating the sharepoint server to a new host which i will be able to use a seperate nic for SSL for this site. will advise
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