Can No Longer Reconfigure My Netgear Extender

[MRK123456]

I have the model EX3700 and it has been working fine for the past 2.5 years. Sometimes I have to go to mywifiext(dot)net to reconfigure it again to get it working properly but now I can't even do that anymore as the website doesn't load on any browser for security issues (screenshot attached). 

Any idea how to solve this???

[plemans]

have you tried a different browser or pc?