Hello GCC and GNU support, I am the proxy service lead for Lockheed Martin and 
something seems to be blocking our traffic when our US users try to reach 
https://gcc.gnu.org/onlinedocs/. Our Non-US users do not have the same issues. 
Our reserved Zscaler IP Space for US users is the following:

136.226.7.128/25 (San Jose)
136.226.98.128/25 (San Jose)
136.226.19.128/25 (Washington DC)
136.226.154.0/25 (Washington DC)

Can you check if there is something on your end blocking traffic from these 
subnets?

Thanks,
Justin Colon
Enterprise IT -- Corporate Information Security
CELL (303) 815 5738

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