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    Ecobee thermostat can’t connect to servers

    Scheduled Pinned Locked Moved General pfSense Questions
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    • E Offline
      ezhawk @stephenw10
      last edited by

      @stephenw10

      wan pcap
      1338d7ae-d96b-4c08-bbf8-d7bfaad8a869-image.png

      lan pcap
      c03e2ead-caf7-4bd1-976b-e334fd43c475-image.png

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      • stephenw10S Offline
        stephenw10 Netgate Administrator
        last edited by

        Hmm, interesting. That dupe ACK is odd. Like the server expects to see something from the client and doesn't. Except the dupe comes 12 microseconds after the first. Other than that it looks like a pretty normal TCP connection. The client just isn't sending or pulling anything. I do note there are no large packets shown. But they are not present on either interface. pfSense seems to be passing that traffic as expected. 😕
        Even when the dupe ACK doesn't happen the server sends a fin-ack pretty much immediately.

        GPz1100G 1 Reply Last reply Reply Quote 0
        • GPz1100G Offline
          GPz1100 @stephenw10
          last edited by

          @ezhawk re vpn

          You can set up a free cloudflare warp wireguard connection using this project - https://github.com/ViRb3/wgcf .

          From the releases page download the one appropriate for your pfsense architecture (or a linux vm).

          Run wgcf register then wgcf generate

          This will create a .conf file from which you can pull the necessary credentials to supply pf's wg package. Use policy based routing to pass ecobee traffic through the cf tunnel. Don't forget to create an outbound nat rule.

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          • GPz1100G Offline
            GPz1100 @stephenw10
            last edited by

            @stephenw10 It would be interesting to compare the state timeout values between pfsense and the other firewall @ezhawk is using. Possible some values are longer in pfsense and/or not playing nicely with the isp?

            Looking at the pfs/system_advanced_firewall.php page, all mine are default. WAN MTU at 1500 too (att fiber connection).

            E stephenw10S 2 Replies Last reply Reply Quote 0
            • E Offline
              ezhawk @GPz1100
              last edited by

              @GPz1100
              mine are all default in the firewall settings too. WAN mtu is actually just using the adaptors default. Don't have any defined MTU.

              GPz1100G 1 Reply Last reply Reply Quote 0
              • stephenw10S Offline
                stephenw10 Netgate Administrator @GPz1100
                last edited by

                @GPz1100 Are you able to grab a pcap for comparison with a working connection?

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                • GPz1100G Offline
                  GPz1100 @stephenw10
                  last edited by

                  @stephenw10 What specifically do you want captured, and for how long? I can use the pf packet capture gui option but what options do you want set there?

                  The ecobee is on the IOT vlan which only has rfc1918 access to dns server and internet.

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                  • GPz1100G Offline
                    GPz1100 @ezhawk
                    last edited by

                    @ezhawk said in Ecobee thermostat can’t connect to servers:

                    @GPz1100
                    mine are all default in the firewall settings too. WAN mtu is actually just using the adaptors default. Don't have any defined MTU.

                    I understand, but since it is working with the other firewall, there must be some difference, no?

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                    • stephenw10S Offline
                      stephenw10 Netgate Administrator
                      last edited by

                      Just a typical TCP stream from the client to the server. Is it sending/receiving large packets every connection for example? Does the connection just remain open?

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                      • GPz1100G Offline
                        GPz1100 @stephenw10
                        last edited by

                        @stephenw10 Attached is a sanitized pcap. Ecobee mac and lan interace mac sanitized to begin with bb dd cc and lan mac begins with 11 22 33.

                        sanitizedpacketcapture--20250828135527.pcap

                        The capture is a 10 min segment of steady state operation.

                        Note, the ecobee tries to resolve api.amazon.com every 50s. This is denied via dns server as well as blocking the entire amazon asn for the ecobee ip.

                        Hope this helps.

                        PS. please delete the previous message - it's already tagged as deleted, please remove permanently.

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                        • stephenw10S Offline
                          stephenw10 Netgate Administrator
                          last edited by

                          Hmm, so it normally just holds open the TCP connection continually.

                          GPz1100G 1 Reply Last reply Reply Quote 0
                          • GPz1100G Offline
                            GPz1100 @stephenw10
                            last edited by

                            @stephenw10 That's why I asked what packages were installed. Perhaps something is interfering.

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                            • E Offline
                              ezhawk @GPz1100
                              last edited by

                              @GPz1100 @stephenw10
                              don't have too many installed.

                              5d6f7cb9-1ad1-49cd-8879-79f123b56857-image.png

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                              • stephenw10S Offline
                                stephenw10 Netgate Administrator
                                last edited by

                                Hmm, are you able to capture the initial connection from the client to the server?

                                E 3 Replies Last reply Reply Quote 0
                                • E Offline
                                  ezhawk @stephenw10
                                  last edited by

                                  @stephenw10
                                  i have a pcap i took yesterday that i was capture while i rebooted the ecobee. trying to go through right now to see if any user/pass might of been passed not encrypted.

                                  GPz1100G 1 Reply Last reply Reply Quote 0
                                  • E Offline
                                    ezhawk @stephenw10
                                    last edited by

                                    @stephenw10
                                    i think it's clean of user/pass. is there a way i can send it without just posting it?

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                                    • GPz1100G Offline
                                      GPz1100 @ezhawk
                                      last edited by

                                      @ezhawk Other than the macs, I saw some exchanges include plain text tstat serial number (the PTR requests). Everything else I think is encrypted, at least between the tstat and ecobee. I can't comment on the amazon traffic as that's all blocked here.

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                                      • E Offline
                                        ezhawk @stephenw10
                                        last edited by

                                        @stephenw10
                                        packetcapture-igc3.999-20250827170525.pcap

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                                        • GPz1100G Offline
                                          GPz1100 @ezhawk
                                          last edited by

                                          @ezhawk Is there a pcap when it's acting up? Or was that the one on the previous page?

                                          E 1 Reply Last reply Reply Quote 0
                                          • E Offline
                                            ezhawk @GPz1100
                                            last edited by

                                            @GPz1100 that pcap is yesterday when i rebooted the ecobee and it can't connect to ecobee.com

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