At a previous job they finally deprecated RC4-MD5, long after almost everyone had stopped using it.
About a week later they had to re-enable it, because it turned out a few major customers had some old SPARC (IIRC?) boxes that used the service. The extra overhead of non RC4-MD5 ciphers was crippling them. There was some seriously frantic back and forth with the customer to get the situation resolved and figure out a timeline to finally, finally, finally deprecate RC4-MD5.
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At a previous job they finally deprecated RC4-MD5, long after almost everyone had stopped using it.
About a week later they had to re-enable it, because it turned out a few major customers had some old SPARC (IIRC?) boxes that used the service. The extra overhead of non RC4-MD5 ciphers was crippling them. There was some seriously frantic back and forth with the customer to get the situation resolved and figure out a timeline to finally, finally, finally deprecate RC4-MD5.