Tightening cipher suites breaks Windows 7 Global protect

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Tightening cipher suites breaks Windows 7 Global protect

L4 Transporter

Hi folks.


I have recently, as I'm sure a lot of us have, attempted to tighten security on my global protect portal.


I ran an SSL labs scan on it, and it came back with a B result because of some older cipher suites still being in use - so I made some changes to try and tighten this up.


I was successful - got it up to an A - but it came at a cost.


I, unfortunately, still have numerous Windows 7 workstations (save the outrage, please, I'm well aware of the risks, and there are legitimate reason I can't upgrade them yet), and it seems that tightening these protocols on the firewall completely broke Global protect on the Windows 7 machines. They simply would not connect.


The changes I made were as follows


1. Minimum TLS version set to TLS 1.2

2. Modified shared ssl-tls profile settings as follows

  1. auth-algo-sha1 no
  2. enc-algo-3des no
  3. enc-algo-aes-128-cbc no
  4. enc-algo-aes-128-gcm no
  5. enc-algo-rc4 no

One of these settings simply broke global protect - I had to revert them all (except the SHA1 and RC4)


Has anyone come across his, and know of a solution on he Windows 7 end? Advice to upgrade to Windows 10, while certainly correct, aren't helpful at this point in time - I'm working to get that happening as quickly as I can.


Oh, the GP client running was 5.0.7


Thanks for any input

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