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  1. #1
    Join Date
    April 2016
    Posts
    5

    Can't connect to server - Can ping, trace, ports are open. What's missing?

    I have a server up and running that I can log into over my local network. Last week, I was able to hit this via my public IP, but now TS3 fails to connect to the server. DNS resolves, UDP is open (per this tool, some results below) and forwarding at my router, and traceroutes and pings reveal the server. I have no idea what's gone wrong here.

    Client log shows name resolving, connection initiating, blacklist checking OK, connecting, then disconnecting. There is nothing indicating why.

    Code:
    [+] Nmap scan report for URL REDACTED (IP REDACTED)
    Host is up (0.12s latency).
    
    PORT     STATE         SERVICE VERSION
    9987/udp open|filtered unknown
    What am I missing?
    Last edited by rafadavidc; April 14th, 2016 at 04:30 AM. Reason: RESOLVED

  2. #2
    Join Date
    April 2016
    Posts
    5
    Well, I think I'll keep this up as a solution for future googlers.

    Teamspeak does NOT support Cut-through Forwarding. Turn NAT acceleration OFF in your router.

    Ugh.

  3. #3
    Join Date
    February 2013
    Location
    Germany
    Posts
    4

    Teamspeak 3 Server have problems with CTF Cut-through-forwarding (NAT Acceleration)?

    Hello Guys,

    after i tried to get my TS3-Server back to work for a few days now, i don't know what i can do anymore.
    So i hope someone can help me here.

    Last week i get a 1Gbps Connection from my ISP and a new Cable Modem.
    My Router ASUS RT-AC66U is still the same.

    After the upgrade the only change to get the full speed is to activate NAT-Acceleration (CTF) in the Router Menu.
    But then the port forwarding rule for Teamspeak isn't working anymore.

    All other port forwarding rules (TCP and UDP) working as before. Only port forwarding to Teamspeak doesn't work.

    I already tried another Router (ASUS RT-AC87U) but it doesn't help.

    So as a conclusion i think Teamspeak can't work together with CTF, because all other udp port forwardings work as expected.

    So after four or five days playing around I now have no idea what i can do to get the server back to working. Expect off disable NAT Acceleration in Router config. But then i only get around 200Mbps.

    Has anyone got the same problem and have an idead what i can do now?

    I thought about using 2 Routers, the first with NAT Acceleration and the second without, and plug my Teamspeak Server on the second one. Would this can help?

    I hope someone can help me here please.

    Greetings,
    Waysti
    Last edited by dante696; January 21st, 2019 at 11:11 AM. Reason: merged

  4. #4
    Join Date
    October 2003
    Location
    Germany
    Posts
    2,409
    Do you have IPv6 connectivity? If so, try connecting via IPv6 (since NAT should not be an issue there) and see if it solves the issue.

  5. #5
    Join Date
    February 2013
    Location
    Germany
    Posts
    4
    Hey ScP,

    thank you for your reply.

    No I still have IPv4 connectivity. I currently get no IPv6 from my ISP. Do you mean NAT-Acceleration (CTF) is working fine with IPv6 but not with IPv4?

  6. #6
    Join Date
    June 2011
    Location
    Germany
    Posts
    4,308
    You don't use NAT for IPv6. Depending on your ISP, you get CIDR /64 or even /56 IPs and assign them to your devices. NAT is meant to be only a workaround for people who lack IPv4 adresses.

  7. #7
    Join Date
    February 2013
    Location
    Germany
    Posts
    4
    Thank you for your reply.

    After some searching I found this Thread here
    https://forum.teamspeak.com/threads/...What-s-missing

    This Thread confirmed that teamspeak is unable to handle cut through forwarding. Damn.

    Too bad, so now i have to search for alternatives to teamspeak which can handle this.
    I guess Teamspeak wouldn't do anything to solve this in the near future...hoping for the next version (5) could handle this.

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