Article ID: 125962, created on Jun 18, 2015, last review on Jun 18, 2015

  • Applies to:
  • Plesk 12.0 for Linux


Webmail is opening very slow, it takes ~40 second to load the webmail page.

From internal network the ping retrieves the following respond:

    # ping -f -l 1589
    ICMP requests with size more than MTU failed


  1. Bandwidth limiter for Apache mod_bw is enabled:

    # httpd -M | grep mod_bw
    Syntax OK
  2. MTU size is not properly set for network.


  1. Disable mod_bw module using Plesk autoinstaller and check the access to webmail:

  2. If access to webmail is still loading very slow in internal network, but from external is loading fine, most probably this can means that packets with size more than MTU are not fragmented. Contact system administrator to check the configuration of network equipment since this issue is considered to be Administative Task which is Out of Odin Technical Support Scope.

    Please use the link for your reference:

    How to find the proper MTU size for my network.

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