bigip_link monitor failing through Prolexic

Hi,

 

 

I have a LC with three different links, one of them through Prolexic. I'm trying to add it to my GTM. Boths port 22 and 4353 are opened between devices. MTU size has been reduced to 1476 which is the maximum allowed through Prolexic GRE tunnels.

 

 

Then I add the LC pair to the GTM using bigip_link monitor and everything goes ok and it discovers all the virtual servers in the LC.

 

 

The problem is that all the resources (virtual servers) through Prolexic link go red.

 

 

Any ideas? Is bigip_link using any special port appart from 22 and 4353 that might be blocked?

 

 

Thanks for your help.

 

 

Manuel