When we attempt to login to 2 separate USG100 devices with latest version of Google Chrome we get the following error: This site can’t provide a secure connection 192.168.1.1 uses an unsupported protocol. ERR_SSL_VERSION_OR_CIPHER_MISMATCHHide detailsUnsupported protocolThe client and server don't support a common SSL protocol version or cipher suite. Followed suggestions detailed here however no difference, same error: https://community.zyxel.com/en/discussion/1920/attempt-to-login-to-usg40-chrome-reports-err-ssl-version-or-cipher-mismatch Curious thing is we can access a USG20W using same browser Chrome from same workstation (Win11 Pro) and no errors - so identical Internet Options, Chrome settings, etc. We believe it must be a different setting on the USG40W compared to USG100 causing this. Anyone have any ideas?

Hi, fw 3.30 AQQ.7 WK48 solve this issue Fred

Hi @AWUSupport Thanks for your update. Because USG100 is an EOL legacy device, users can use the Edge browser in IE Mode to login to USG100 for a workaround solution. The user could follow the below procedures to login to USG100, thanks. STEP1. Enter the USG100 login page via the Edge browser and reload the page in IE mode. STEP2. Then can enter the device login page.

Hello @AWUSupport The reason is their TLS version is different. The TLS version of the ZyWalll USG100 is V1 but the TLS version of the ZyWalll USG20W is V1.2. Once the browser doesn't support the TLS V1 connection and would show the below information. I captured the packet at my lab site, please refer to the below results: It was captured from ZyWall USG 100. It was captured from ZyWall USG 20W. Thanks.

Attempt to login to USG100, Chrome reports ERR_SSL_VERSION_OR_CIPHER_MISMATCH

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Zyxel_Jeff Posts: 1,286 Zyxel Employee

December 2022

AWUSupport said:

Must have missed that Jeff, great article.

OK, noted it. Thanks for your reminder .

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