syntax to run tcpdump for a specific source IP & tcp port

We are using IE & wget to download a pdf file down from an Apache web server
(on RHEL 6.x) which gets the file from an app server (also on RHEL 6.x).

What's the exact tcpdump command to run (& save the output to a file) which
I can specify the Windows PC & the web server's IP (as source IP)?  Suppose the
port used is Tcp8443, how can I filter the tcpdump further by port?

I'm simulating to download that pdf file by issuing wget directly on the RHEL
web server (ie for eg:   "wget http://localhost/full_URL_to_the_Pdf_file") to
isolate if the issue lies upstream (ie at webserver & app server as well as
the network between the web & app servers) or downstream (ie from the
users PC to the webserver & the networks between them): does this method
give a conclusive isolation at which legs of the networks/server the issue lies?

Anyone encountered any issue where PDF file is partially downloaded only
& what's the likely cause?  Firewall, Apache webserver, IPS, F5 loadbalancer,
apps & app server (that hosts the Pdf file)?
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You should use separate questions to get perspective.

Likely issue is that there is an anti-virus that kicks in in scanning interfering with transfer.

Try to see if you transfer the data on the same system from which you are transferring.

tcpdump -i interface -p  -w output_file port 8443 and ip host ip_address

Double check that it is not an issue in type designation. Check the size on the server, and the retrieved size.
Depending where the file was created and how it hot to where it is being served, I.e. Might have been corrupted during upload.

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