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HTTPS post site creating 403 errors in IIS 6.0 logs

I have created an HTTPS based site in IIS 6.0 which accepts HTTPS posts using a CGI file. For the last month or so since data has been sent to this site I have had reports from clients saying about 'connection timeouts' and 'connections freezing'.

The firewall in front of the server will only accept HTTPS connections. After checking the logs there seems to be a number of port 443 connections to the CGI file that have been successful. But a number of entries listed are as follows:

2008-05-23 07:00:01 212.188.x.x HEAD / 80 212.188.x.x 403 64 0 19

Can anyone help with these entries or help troubleshooting the lost connections to the site.

Microsoft IIS Web ServerWindows Server 2003SSL / HTTPS

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8/22/2022 - Mon

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Thanks for the tip. Have enabled http-sub-status in IIS logging properties and it turns out that the error is a 403.14 error:

2008-05-27 07:24:47 HEAD / 80 403 14 64 0 19

What I can't understand is that the site is receieving HTTPS posts successfully, there should not be any HTTP entries in the logs. Does IIS do something automatically like an HTTP keep alive (have disabled this in website properties)?

Any help appreciated.
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