421 too much connexions

[doctau]

Hello the community,

In my office we have 2 Zimbra servers with 6.0.5_GA_2213.RHEL5 version.

since Friday when my Zimbra1 or another mailserver on the Net send mails to Zimbra2 the mails are in deferred status and i see in /opt/zimbra/log/zimbra.log of my Zimbra1 this message :

Oct 19 19:45:01 zimbra postfix/smtp[28018]: E6904142C00C: to=<XXXXXX.fr>, relay=XXX.XXX.fr[XX.XX.XX.XX]:25, delay=34105, delays=34105/0.04/0.04/0, dsn=4.0.0, status=deferred (host XXX.XXX.fr[XX.XX.XX.XX] refused to talk to me: 421 too many connections)

Today, it's worse and the deferred mailqueue increase dangerously. I'm looking for the cause but don't find the reason of this message "421 : too many connections".

This is the qshape result command of Zimbra1 :

  T  5 10 20 40 80 160 320 640 1280 1280+
                                  TOTAL 128  1  1  0  1  1  23  54  44    2     1
                                   AAA.fr 121  1  1  0  0  0  23  53  43    0     0
                                BBB.com   3  0  0  0  1  0   0   0   1    0     1
                               CCC.com   1  0  0  0  0  0   0   0   0    1     0
                               DDD.com   1  0  0  0  0  0   0   1   0    0     0
                            EEE.com.br   1  0  0  0  0  1   0   0   0    0     0
                                     FFF.in   1  0  0  0  0  0   0   0   0    1     0

and that, the result of top command on Zimbra2 :

Tasks: 156 total,   2 running, 154 sleeping,   0 stopped,   0 zombie
Cpu(s): 75.5%us,  5.0%sy,  0.0%ni, 19.3%id,  0.2%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   3115796k total,  2981568k used,   134228k free,   109392k buffers
Swap:  2096472k total,      116k used,  2096356k free,   789776k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+ COMMAND                                                                      
 6411 zimbra    19   0  420m  30m  11m S 58.2  1.0   0:01.75 java                                                                         
 8260 zimbra    17   0 1373m 1.1g  12m S 51.9 37.0  97:43.38 java                                                                         
 5462 zimbra    18   0  400m 287m 4552 S  0.7  9.5   6:05.20 mysqld                                                                       
 2456 zimbra    18   0  227m  52m  10m S  0.3  1.7   9:19.47 slapd                                                                        
 6236 zimbra    15   0  2428 1056  800 R  0.3  0.0   0:00.04 top                                                                          
    1 root      15   0  2160  588  508 S  0.0  0.0   0:00.96 init                                                                         
    2 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 migration/0                                                                  
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0                                                                  
    4 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/0                                                                   
    5 root      RT  -5     0    0    0 S  0.0  0.0   0:01.81 migration/1                                                                  
    6 root      34  19     0    0    0 S  0.0  0.0   0:00.02 ksoftirqd/1                                                                  
    7 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/1                                                                   
    8 root      10  -5     0    0    0 S  0.0  0.0   0:00.01 events/0                                                                     
    9 root      10  -5     0    0    0 S  0.0  0.0   0:00.01 events/1                                                                     
   10 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 khelper

When i do a netstat on Zimbra2 i see lot of connections between JAVA and mysqld (port 7306)

can you help me to resolve this big problem please ? I don't know what to do !!!