Date: Thu, 9 Jun 2005 09:18:50 -0600 From: mbeltran@americatel.com.sv To: freebsd-questions@freebsd.org Subject: trouble to connetc to random remote servers with telnet Message-ID: <76E0DAA32C39D711B6EC0002B364A6FA047858DF@amsal01exc01.americatel.com.sv>
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Hi everyone I have a box, a FreeBSD 5.3-release whit qmail version 1.03 and the SPAMCONTROL patch 2.3.11, all have worked fine, but since a few days i cant connect to several random mail servers. i have a cisco gateway that hasnt changed any config. One of my qmail log message is this: @4000000042a734fd0287b674 starting delivery 193941: msg 8543907 to remote abcdefg@laprensa.hn @4000000042a734fd0287b888 delivery 193941: deferral: Connected_to_200.30.172.163_but_connection_died._(#4.4.2)/ I guess that I had problems with qmail. So, i try to connect manually to the remote box, but a i got this message: asgard1# telnet 200.30.172.163 25 Trying 200.30.172.163... Connected to correos.laprensa.hn. Escape character is '^]'. Connection closed by foreign host. The next step was to ping the remote server and i got this: asgard1# ping 200.30.172.163 PING 200.30.172.163 (200.30.172.163): 56 data bytes 64 bytes from 200.30.172.163: icmp_seq=0 ttl=120 time=592.278 ms 64 bytes from 200.30.172.163: icmp_seq=1 ttl=120 time=598.336 ms 64 bytes from 200.30.172.163: icmp_seq=2 ttl=120 time=473.944 ms ^C --- 200.30.172.163 ping statistics --- 4 packets transmitted, 3 packets received, 25% packet loss round-trip min/avg/max/stddev = 473.944/554.853/598.336/57.264 ms And then I have run tcpdump while i did telnet to the host again and the response was: asgard1# /usr/sbin/tcpdump -vv dst host 200.30.172.163 tcpdump: listening on bge0, link-type EN10MB (Ethernet), capture size 96 bytes 14:41:57.581161 IP (tos 0x10, ttl 64, id 29721, offset 0, flags [DF], length: 64, bad cksum 0 (->e8b7)!) asgard1.americatelsal.com.50523 > correos.laprensa.hn.smtp: S [bad tcp cksum de09 (->4972)!] 2831888326:2831888326(0) win 65535 <mss 1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 1002910953 0> 14:41:58.589763 IP (tos 0x10, ttl 64, id 29929, offset 0, flags [DF], length: 52, bad cksum 0 (->e7f3)!) asgard1.americatelsal.com.50523 > correos.laprensa.hn.smtp: . [bad tcp cksum ddfd (->3a17)!] 2831888327:2831888327(0) ack 2488154443 win 33304 <nop,nop,timestamp 1002911054 0> 14:41:59.770450 IP (tos 0x10, ttl 64, id 30131, offset 0, flags [DF], length: 52, bad cksum 0 (->e729)!) asgard1.americatelsal.com.50523 > correos.laprensa.hn.smtp: . [bad tcp cksum ddfd (->29f2)!] 0:0(0) ack 2 win 33304 <nop,nop,timestamp 1002911172 9178914> 14:41:59.770565 IP (tos 0x10, ttl 64, id 30132, offset 0, flags [DF], length: 52, bad cksum 0 (->e728)!) asgard1.americatelsal.com.50523 > correos.laprensa.hn.smtp: F [bad tcp cksum ddfd (->29f1)!] 0:0(0) ack 2 win 33304 <nop,nop,timestamp 1002911172 9178914> Look at the "bad tcp cksum" message, is the only thing that i look strange. But is very extrange that I can connect with telnet on 80 port to the same server, look at following lines: asgard1# telnet 200.30.172.163 80 Trying 200.30.172.163... Connected to correos.laprensa.hn. Escape character is '^]'. quit HTTP/1.1 400 Bad Request ( The data is invalid. ) Connection: close Pragma: no-cache Cache-Control: no-cache Content-Type: text/html . . .... etc If i tried to connect using others mailservers running or not running qmail on the same subnet, i got this successful message: [root@thor mbeltran]# telnet 200.30.172.163 25 Trying 200.30.172.163... Connected to correos.laprensa.hn (200.30.172.163). Escape character is '^]'. 220 laprensa.hn ESMTP MDaemon 6.8.4; Wed, 08 Jun 2005 14:41:16 -0600 quit 221 See ya in cyberspace Connection closed by foreign host. I really dont know what thing should i do for solve this problem. Any suggestions? Thanks in advance and regards. Mario.
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