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Instance HTTP issues

Hello All, I am currently running openstack juno in ubuntu server 14.04 under the 3-node architecture using the neutron networking scheme with internal gre and flat external network as described in the openstack documentation.
I am able to connect to the internet perfectly fine. I have tested ftp/sftp and ssh using clients such as putty and filezilla.
My issue lies with http connections. I am able to utilize any browser and browse any site almost perfectly fine, with minimal error pages. However; whenever I attempt to download any file through the browser, as soon as I click save, I receive an error stating that the server disconnected.
I have no errors in any of my logs, my virtual router's gateway interface shows as down but I am still able to connect to the internet. Also this is a recurring issue I was having with Icehouse that coerced me to upgrade to Juno, and the router's gateway displayed fine in Icehouse.
I do notice the br-ex adapter has many dropped rx packets and I do not know why. All of the hosts' management interfaces have dropped rx packets and upon research I discovered it could be due to the servers not being configured for IPv6, which is normal, or bad vlan tagging, which, if true, I have been unable to detect.
This is all running under a proxmox cluster environment and I am aware of the hypervisor requirements. The servers show that they are in promisc mode, although when I tested promisc mode with a vm using wireshark it didn't seem to catch all traffic. This could be due to my router using switch-ports, but I can imagine anyone working with openstack uses switches vs hubs.
I have no firewall rules that seem to be blocking protocols and I am able to ping and tracert external sites such as google.com from within the instances with ease, as well as utilize tools such as filezilla and putty.
I have tested changing MTU values but that doesn't seem to be the issue, of course, making the MTU value 1500 destroys my instance's ability to connect to the internet, however, anything lower than 1454 has the same results.
I have read the documentation many times and I am sure I haven't missed anything. This is a strange issue that I have not witnessed before, which is making it more difficult for me to find the cause. If anyone has any ideas please post.
Thank You