When downloading files from certain websites, my end users experience intermittent issues. On one site, WebEx, where you can download recordings, transmission speeds start off high and then gradually go to zero and the transmission dies. Researching this issue came across the TCP Window Scale option. I verified that my firewall (Cisco ASA running latest ASA software) is set to allow window scaling (it doesn't zero out the options). The thing with this issue is I don't see anything logged to the access log. No start of transmission or end of transmission. Another user reported that they were receiving HTTP 500 errors when trying to download artifacts for Artifactory (build server). When looking at the access.log I see TCP_MISS/500 errors. Now usually HTTP 500 errors are server side errors. So I indicated this to my user saying the server they are downloading from is returning the 500 error. They didn't agree and as a temporary work around I allowed direct access for that server out to the internet. They now say the issue is resolved (don't really agree with them at this point). What is the best route to go in debugging download issues? Thanks
