http - Connection to website cannot be established (randomly) -

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we manage website: http://elearning.uem.mz

it mozambique (hosted in portugal), , have lot of complaints users can't connect it.

it seems problem connection user, can't pinpoint exact problem.

what know is:

  • it affects randomly (a computer works 1 day, next doesn't);
  • it seems based on time (a user won't able connect 30 minutes 2 hours);
  • sometimes gives privoxy 500 error;
  • sometimes gives err_names_not_resolved;
  • it affects browsers.

we created small .bat script has run administrator:

ipconfig /flushdns ipconfig /renew ipconfig /registerdns

this seems solve times, each issue has handled individually.

is there minimize issue?

after lot of time , testing, found out problem happening every other site in respective country...

it seems have been problems/upgrades whole infra-structure was, , still is, messing dns.


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