Port 1433 Blocking by the Router

Discussion in 'Tomato Firmware' started by leony, Apr 15, 2014.

  1. leony

    leony Network Newbie Member


    It is maybe better to open a new thread if I can help anyone having the same problem.

    Would Shibby or Toastman builds block port 1433 (Microsoft SQL Server) in a LAN environment?

    Or maybe if I ask the question in a different way, would a router block any LAN ports? (not from outside, just inside ports) which affects connection to a network resource?

    Because I can connect to my SQL server when using 1.28 Tomato Firmware whereas when I plug the router with the Shibby or Toastman builds and restart the server, it stops working.

    In all cases I do not touch any configuration in the server!

    Server has static IP Address in both cases

    Any help is appreciated as I am about to go crazy over this.
  2. koitsu

    koitsu Network Guru Member

    No, there is no "port blocking" on the LAN segment (that includes Ethernet as well as Wireless); LAN traffic is unfiltered out-of-the-box.
  3. leony

    leony Network Newbie Member


    Many thanks in this case I should be looking at the Server itself not the router as the router only establishes the connection? If the connection is rejected, it is either the Server or Client.

    Is this correct?
  4. blah123

    blah123 Reformed Router Member

    Is there a difference in name resolution between how you had plain tomato configured and toastman or shibby? If you can connect between the same 2 systems on different services that is the only thing I can think of is that sql connection uses a different name/ip than the service that does work.
  5. leony

    leony Network Newbie Member

    In regards to configuration, both plain Tomato and others have same configurations (network settings, static IPs, port forwardings etc..)

    I do not touch Advanced settings, they are all default. Literally I take plain Tomato out and put Shibby or Toastman, until I restart the Server, there is connection.

    I restart the server, it loses the connection.

    I take Shibby or Toastman out, put plain Tomato back on, The connection does not come back until I restart the server. After the server is restarted, it connects again!
  6. rhester72

    rhester72 Network Guru Member

    This is entirely too empirical.

    Without an actual tcpdump capture (from both the router and the target server) showing the correct and failing behavior, there's little that can be done to diagnose this.

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