Messages in this thread | | | From | "Keane, Patrick" <> | Subject | SYN_RECV hangs... | Date | Tue, 29 Jun 1999 15:05:00 -0400 |
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<P><FONT SIZE=2>I am having problems with our new Linux 2.2.10 ftp server box, call it "troubled.linux-box.com". This machine is used as an FTP server. Under Linux 2.0.36, we had no problems, but I recently setup a new machine with 2.2.10 to use instead. I have no problems connecting from almost every system I try (within our network or outside of it). However, when one of our customers attempts to ftp to the machine, netstat -r shows the connection hanging in SYN_RECV (shown below). It does this for about 30 seconds on the client's side before giving up (Connection timed out). On the server side, the connection disappears from netstat. I am at wits end. I have tried using other TCP/IP-based daemons on the server, such as telnetd, and all attempts to connect from this site also fail, in the same way. So, I am assuming that ftpd is not the source of the problem.</FONT></P>
<P><FONT SIZE=2>The only difference between this site that cannot connect and others that can is that they are attempting to connect from behind a firewall. (Before you guess that their firewall is misconfigured, keep in mind that I can switch back to the 2.0.36 machine at any time, and using the same IP address for the machine, connect without any problems at all). Because it DOES work under 2.0.36, I have temporarily switched our server back, but would really like to get back to using the 2.2.10 box. Can ANYONE explain to me what might be going on? The client says that they show NO traffic coming back from our server. My only guess is that this is a kernel bug or kernel misconfiguration, but I see no configuration options that apply to this. I am not using any firewalling/ipchaining/or TCP IP razzle-dazzle on this machine, just plain TCP Networking selected. Please help</FONT></P>
<P><FONT SIZE=2> </FONT> <BR><FONT SIZE=2>Netstat -r shows:</FONT> </P>
<P><FONT SIZE=2>tcp 0 0 troubled.linux-box.com:ftp client.who-cant-connect.com11272 SYN_RECV</FONT> </P>
<P><FONT SIZE=2>** please reply to </FONT><A HREF="mailto:keane@danet.com"><U><FONT COLOR="#0000FF" SIZE=2>keane@danet.com</FONT></U></A><FONT SIZE=2> **</FONT> </P>
<P><FONT SIZE=2>Thanks</FONT> <BR><FONT SIZE=2>Patrick</FONT> </P>
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