VMware Horizon Community
szilagyic
Hot Shot
Hot Shot

High HTTPS traffic from Horizon Client to Connection Server

Hello:

We are in the middle of troubleshooting a ThinPrint printing issue with some of our thin clients and I have been watching the thin client traffic more closely trying to identify a slowness issue we are having only with ThinPrint.  All of our thin clients are a custom Windows 10 1607 image of ours that run the Horizon Client 4.3.  When I look at traffic between the thin clients and our connection servers, I noticed that there is the normal PCoIP traffic which I expect, but there's also a fair amount of HTTPS traffic as well.  Each thin client has both PCoIP traffic, and HTTPS traffic, ranging from 400KB to 700MB over a period of 2 days approximately.  In our GPO we force PCoIP as the display protocol.  But, what would the HTTPS traffic be, then?  I thought HTTPS was only used for the initial authentication, and then it would switch over to PCoIP after that.  But we are seeing a lot of  HTTPS traffic, more than I would expect.  I'm not sure if this is related to our Thinprint slowness issue but thought it was odd.

Can anybody tell me what would be using a lot of HTTPS traffic from the Horizon Client software to the Connection Server??  All of our clients have the Horizon Client 4.3, and our connection servers are on 7.0.3 as well as the Horizon Agent being on 7.0.3.

Thanks in advance.

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schmidtl
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If you're enforcing PCoIP, Port 443 is (besides initial handshake & authentication) used for things like Client Drive Redirection and USB Redirection.

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szilagyic
Hot Shot
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If you're enforcing PCoIP, Port 443 is (besides initial handshake & authentication) used for things like Client Drive Redirection and USB Redirection.

OK thanks.  I didn't realize those two things were also using 443.  According to some of the Horizon docs, it says USB redirection uses 32111 TCP, but doesn't mention the Client Drive Redirection or other traffic.  I appreciate the help.

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