App Control Proxy-Access block prevents Google Apps from loading

08/03/2020 20 8090

DESCRIPTION:

When proxy access block is enabled within App control Google Apps such as Youtube and Google Play store will not load correctly. 

CAUSE:

Two signatures within proxy access App control "sig ID 6 proxy access non ssl traffic over ssl port"  and "sig ID 7 Encrypted Key Exchange -- UDP Random Encryption(UltraSurf)" will inhibit access to Google Apps because the services currently are utilizing traffic in a way that identifies with these signatures. At the time this only impacts Android devices.  As a workaround the block can be disabled for these signatures or you can follow the instructions on this KB in order to leave the block enabled. 

RESOLUTION:

Create a custom FQDN address object exclusion group including the following domains: *.googleapis.com, *.youtube.com, *.googlevideo.com, *.ytimg.com, *.gstatic.com, *.googleusercontent.com, *.ggpht.com, *.clients.google.com, *.1e100.net. 

Exclude the custom fqdn address object from App Control "sig ID 6 proxy access non ssl traffic over ssl port"  and "sig ID 7 Encrypted Key Exchange -- UDP Random Encryption(UltraSurf)" Since  the Proxy-Access block is most likely enabled at the category level within App Control use the following logic to disable the block only for the custom address object. 

Open both signature configurations in App Control and select "disable" to unblock the signature. Select the newly created FQDN address object as the Included IP Address Range. This will disable the block only for the domains specified in the custom FQDN address object.