There is currently an internet wide issue with an Intermediary certificate issued by Quo Vadis which has been revoked without warning. The effect of which is that some users are seeing some websites as untrusted. ITS are replacing the revoked intermediary certificate on any web service that we have installed it on with a new certificate issued by Quo Vadis, So far we have replaced it on www.londonmet.ac.uk and staff.londonmet.ac.uk. We are working on the highest priority websites but we will need to complete all web servers as soon as possible after that, replacing this certificate should not be service affecting. This is incident affects the internet and we are doing our bit to fix our part of it, thanks!