Karlis, is there any kind of flooding of TCP connections on your machine? (As in, you have a TCP server running that does not limit the number of concurrent connections and then you're flooded, or, you are making huge amounts of TCP connections yourself?
2013/9/18 KÄrlis MiÄ·elsons <[email protected]> > Hello again, > > > Should I just increase kern.maxclusters and see if the problem goes >> away or are developers interested in me doing some other tests? How much >> should I increase maxclusters? >> > Increasing kern.maxclusters to 18432 didn't fix the problem, system hanged > up after 2 weeks uptime again. > > "none of TCP services respond" - please expand on this: if you try and >> connect to a listening port, does it totally fail to respond, i.e.: >> >> $ telnet $somehost 25 >> Trying $somehost... >> << big pause >> >> telnet: connect to address $somehost: Connection timed out >> >> Or, does it connect but you get no connection banner / response, i.e. >> >> $ telnet $somehost 25 >> Trying $somehost... >> Connected to $somehost. >> Escape character is '^]'. >> << just sits there >> >> >> (Look at a couple of different ports and see if there's any difference - >> some daemons fork a new process to answer a request, some don't). >> > Scanning hostname.domain.lv (XX.YY.ZZ.157) [1000 ports] > Discovered open port 587/tcp on XX.YY.ZZ.157 > Discovered open port 53/tcp on XX.YY.ZZ.157 > Discovered open port 143/tcp on XX.YY.ZZ.157 > Discovered open port 995/tcp on XX.YY.ZZ.157 > Discovered open port 993/tcp on XX.YY.ZZ.157 > Discovered open port 22/tcp on XX.YY.ZZ.157 > Discovered open port 443/tcp on XX.YY.ZZ.157 > Discovered open port 465/tcp on XX.YY.ZZ.157 > Completed Connect Scan at 09:57, 4.73s elapsed (1000 total ports) > Nmap scan report for hostname.domain.lv (XX.YY.ZZ.157) > Host is up (0.0058s latency). > Scanned at 2013-08-31 09:56:54 EEST for 6s > Not shown: 992 filtered ports > PORT STATE SERVICE > 22/tcp open ssh > 53/tcp open domain > 143/tcp open imap > 443/tcp open https > 465/tcp open smtps > 587/tcp open submission > 993/tcp open imaps > 995/tcp open pop3s > > Read data files from: /usr/local/share/nmap > Nmap done: 1 IP address (1 host up) scanned in 6.27 seconds > > $ date; telnet XX.YY.ZZ.157 143; date > Sat Aug 31 09:59:57 EEST 2013 > Trying XX.YY.ZZ.157... > Connected to XX.YY.ZZ.157. > > Escape character is '^]'. > > $ date; ssh -v hostname; date > Sat Aug 31 09:57:53 EEST 2013 > OpenSSH_6.2, OpenSSL 1.0.1c 10 May 2012 > debug1: Reading configuration data /home/username/.ssh/config > debug1: /home/username/.ssh/config line 72: Applying options for hostname > debug1: Reading configuration data /etc/ssh/ssh_config > debug1: Connecting to hostname.domain.lv [XX.YY.ZZ.157] port 22. > debug1: Connection established. > debug1: identity file /home/username/.ssh/t1 type 1 > debug1: identity file /home/username/.ssh/t1-cert type -1 > debug1: Enabling compatibility mode for protocol 2.0 > debug1: Local version string SSH-2.0-OpenSSH_6.2 > ssh_exchange_identification: read: Connection timed out > Sat Aug 31 14:09:09 EEST 2013 > > $ host www.domain.lv XX.YY.ZZ.157 > ;; connection timed out; no servers could be reached > > $ date; telnet XX.YY.ZZ.157 143; date > Sat Aug 31 09:59:57 EEST 2013 > Trying XX.YY.ZZ.157... > Connected to XX.YY.ZZ.157. > > Escape character is '^]'. > ^C^] > telnet> Connection closed. > Sat Aug 31 14:34:18 EEST 2013 > > --- hostname.domain.lv ping statistics --- > 62900 packets transmitted, 62897 packets received, 0.0% packet loss > round-trip min/avg/max/std-dev = 0.487/0.830/110.194/1.332 ms > > > -- > Karlis
