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Hey guys I've got a question.

I've installed a server 2012 R2 hyper-v with a few VM's in them. One of them is a TS. My client is having issues with the TS because every now and then they get a popup from RDP that the connection is interrupted and that it will retry to setup the connection. This is visible for less then a second, but is very disruptive when working.

I've been doing some captures on the Hypervisor itself and am seeing a lot of RST, ACKs when the interruptions appear. The stream can be going for some time but they all end the same.

212651  2287.339664000  TPKT    155 Continuation
212693  2287.540852000   TCP 60  61059→3389 [ACK] Seq=76446 Ack=237599 Win=64768 Len=0
213075  2288.339741000  TPKT    155 Continuation
213292  2288.652196000  TPKT    155 [TCP Retransmission] Continuation
213319  2289.261509000  TPKT    155 [TCP Retransmission] Continuation
213334  2289.339681000  TPKT    155 Continuation
213437  2290.339736000  TPKT    155 Continuation
213444  2290.464660000  TPKT    357 [TCP Retransmission] Continuation
213631  2291.339771000  TPKT    155 Continuation
213709  2292.355402000  TPKT    155 Continuation
213735  2292.870883000  TPKT    559 [TCP Retransmission] Continuation
213828  2293.355672000  TPKT    155 Continuation
214009  2294.355357000  TPKT    155 Continuation
214204  2295.370990000  TPKT    155 Continuation
214206  2295.371172000   TCP 66  [TCP Dup ACK 212693#1] 61059→3389 [ACK] Seq=76446 Ack=237599 Win=64768 Len=0 SLE=238306 SRE=238407
214230  2295.465630000   TCP 60  61059→3389 [RST, ACK] Seq=76446 Ack=237599 Win=0 Len=0
214265  2295.538954000   TCP 66  61214→3389 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
214268  2295.539242000  TCP 66  3389→61214 [SYN, ACK] Seq=0 Ack=1 Win=64000 Len=0 MSS=1460 WS=1 SACK_PERM=1
214270  2295.539754000   TCP 60  61214→3389 [ACK] Seq=1 Ack=1 Win=65536 Len=0

As you can see the connection is happily resumed after the reset.

Any idea what could be causing these resets? The capture is performed on the NIC that handles all VM traffic. The client I've been using to test is connected to the same switch as the Hyper-V server. The Hyper-V isn't using any teaming on the virtual nic.

asked 10 Mar '15, 08:22

Fraeco's gravatar image

accept rate: 0%

closed 26 Mar '15, 02:46

Jaap's gravatar image

Jaap ♦


I have same problem but with physical machines (no hyperv). The problem appear when the connection pass by a NetASQ Firewall. Have you any solution ?

(25 Mar '15, 15:01) jboitel

The question has been closed for the following reason "Question is off-topic or not relevant" by Jaap 26 Mar '15, 02:46

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question asked: 10 Mar '15, 08:22

question was seen: 3,683 times

last updated: 26 Mar '15, 03:33

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