05-10-2007 09:58 PM - edited 02-21-2020 03:02 PM
Hi, I have a whole site that can't access many secure sites https. There is nothing that we can see setup to block port 443. The only way around it that I have found is that if the cisco VPN client is installed onto the computer and then uninstalled it seems to fix it. Does anyone know how the installation of the VPN client works that may change the way the PC gets to certain areas. I really want to know why this seems to fix the problem
05-10-2007 10:32 PM
VPN client do only one thing in this case - it lowers MTU settings of the PC from default 1500 to 1300 value...So it reason why PCs with VPN client can access Internet ...
Some details about MTU
http://help.expedient.net/broadband/mtu.shtml
what connection do you use??? Some ADSL lines require MTU between 1430 -1452 I suggest lower MTU for your PCs to 1430...
Here is guide how lower MTU without VPN client installing
http://help.expedient.net/broadband/mtu.shtml
M.
Hope that helps rate if it does
05-14-2007 04:58 PM
Hi
It turned out to be an issue on a router down the line at another site. The MTU was set wrong and your post led me in the right direction thanks for your help.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide