The encryption used by the server hosting this URL is insecure.

Hi LHerzog,

I recommend opening a support case regarding this issue. When looking through currently opened cases, it looks like there is an open development investigation that is ongoing related to the behavior you're experiencing. I recommend referencing the following ID in your case as well.
- WINEP-39587

thanks, will do.

found out, that this is some kind of strange because each time, I reload or open the URL in the browser, it shows always the Sophos block page in Firefox but

three different error message in MS Edge:

log from EP

C:\ProgramData\Sophos\Sophos Network Threat Protection\Logs

SophosNetFilter.log

2022-03-23T09:06:36.996Z [ 8256: 8324] I [webengine] New connection 0x2bcf1f4df40
2022-03-23T09:06:36.996Z [ 8256: 6688] I [clienthello] connection:0x2bcf1d99e60 sni:support.hiddenforprivacy.com flowId:4779 decision:decrypt
2022-03-23T09:06:36.997Z [ 8256: 6688] I [check-ip] connection:0x2bcf1f4df40 ip:161.71.xxx.xxx flowId:4778 decision:continue
2022-03-23T09:06:37.000Z [ 8256: 6688] I [clienthello] connection:0x2bcf1f4df40 sni:support.hiddenforprivacy.com flowId:4778 decision:decrypt
2022-03-23T09:06:37.077Z [ 8256: 8324] E SSL_do_handshake returned SSL error= 1 reason=1000 error:00000001:lib(0):func(0):reason(1) SSL*=000002BCF1C7A320
2022-03-23T09:06:37.080Z [ 8256: 8324] E Failed to set up SSL MITM encryption: Unrecoverable SSL error during handshake(): error:000003E8:lib(0):func(0):reason(1000)
2022-03-23T09:06:37.086Z [ 8256: 8316] E Connection closed before handshake completed
2022-03-23T09:06:37.089Z [ 8256: 8316] E Connection closed before handshake completed
2022-03-23T09:06:37.091Z [ 8256: 8316] E Connection closed before handshake completed
2022-03-23T09:06:37.093Z [ 8256: 8316] I [webengine] Closing connection 0x2bcf1d99e60 for 'support.hiddenforprivacy.com': request=1335b, response=103b, lifetime=98ms, firstResponse=83ms, businessLogicDelay=0ms, timeInCache=10ms, in=92ms, out=97ms, l.eos=98ms
2022-03-23T09:06:37.125Z [ 8256: 8324] E SSL_do_handshake returned SSL error= 1 reason=1000 error:00000001:lib(0):func(0):reason(1) SSL*=000002BCF1C6FAB0
2022-03-23T09:06:37.127Z [ 8256: 8324] E Failed to set up SSL MITM encryption: Unrecoverable SSL error during handshake(): error:000003E8:lib(0):func(0):reason(1000)
2022-03-23T09:06:37.134Z [ 8256: 8316] E Connection closed before handshake completed
2022-03-23T09:06:37.141Z [ 8256: 8316] I [webengine] Closing connection 0x2bcf1f4df40 for 'support.hiddenforprivacy.com': request=517b, response=103b, lifetime=145ms, firstResponse=129ms, businessLogicDelay=0ms, timeInCache=8ms, in=137ms, out=137ms

case# 05059650

the issue was caused by XG SSL decryption in front of Intercept-X.

The XG did not know the intermediate CA provided by the website.

GoDaddy Secure Server Certificate (Intermediate Certificate) - G2

973a41276ffd01e027a2aad49e34c37846d3e976ff6a620b6712e33832

adding CA on XG and the error was gone with Intercept-X