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How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

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How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

Secure Connection Failed SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

I have been receiving this error message recently when I tried to access school elearning websites and other school related websites, I have also tried on internet explorer and it shows page cannot be displayed. I have been trying the available solutions to solve it but none of them work. Is there alternative solutions available? Please advise. Thanks.

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Site Moderator

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

That link works fine for me. I'm not seeing any error message.

What are the connection settings?

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":


2014-01-05-15-45-22-28b450.png
6 REPLIES
Site Moderator

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

Can you post a link to a publicly accessible page that doesn't require authentication (signing on)?

Can you reach this page via a normal http connection in case the server isn't set up properly?

You may have to use "Forget About This Site" to make Firefox use a http connection.

You can try to test if there is a problem with TLS by temporarily disabling TLS.

You can set the security.tls.version.min and security.tls.version.max prefs to 0 to disable TLS (0 means SSL3).
You may need to close and restart Firefox after changing these prefs.

security.tls.version.min = 0
security.tls.version.max = 0

Note that this is only meant as a quick test and you should reset the two prefs afterward.

New Contributor

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

Thank you for your advice, I've tried temporarily disabling TLS and restart Firefox but it didn't work.

Sorry, but may I ask you what do you mean by:

"Can you post a link to a publicly accessible page that doesn't require authentication (signing on)?

Can you reach this page via a normal http connection in case the server isn't set up properly?"

Site Moderator

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

That is about the address (URL) of the website that you try to visit.

Then we can see if the problem occurs for us as well or only a problem on your side.

New Contributor

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

This is the link: https://learn.nyp.edu.sg/webapps/portal/frameset.jsp

I have also tried using another computer at home to access the link with Firefox but the same error message appeared.

Site Moderator

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

That link works fine for me. I'm not seeing any error message.

What are the connection settings?

If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":


2014-01-05-15-45-22-28b450.png
New Contributor

Re: How to fix this problem? Secure Connection Failed, SSL received a record with an incorrect Message Authentication Code. (Error code: ssl_error_bad_mac_read)

It works after I disabled IPv6 in Firefox. Thank you for your help Smiley Happy