Network Service Error

[leencenters]

Hello
When i reply to message . an error in attachment appear ,
How can i fix this problem

[leencenters]

Zimbra version 8.6 and OS :Redhat 6.5

[leencenters]

[zimbra@ ~]$ zmprov gcf zimbraInvalidLoginFilterMaxFailedLogin
zimbraInvalidLoginFilterMaxFailedLogin: 0

[tayyabsaeed]

Please paste the output of below commands:

# ip a s | grep -w inet | cut -d' ' -f 6

# su - zimbra
$zmprov gcf zimbraHttpThrottleSafeIPs

[leencenters]

The problem occur outside my company and not all the time in case " Replying to email"

zmprov gacf |grep -i zimbraHttpDosFilter
zimbraHttpDosFilterDelayMillis: 0
zimbraHttpDosFilterMaxRequestsPerSec: 100

zmprov gacf |grep -i InvalidLoginFilter

zimbraInvalidLoginFilterDelayInMinBetwnReqBeforeReinstating: 15
zimbraInvalidLoginFilterMaxFailedLogin: 0
zimbraInvalidLoginFilterMaxSizeOfFailedIpDb: 7000
zimbraInvalidLoginFilterReinstateIpTaskIntervalInMin: 5