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Blog Owners Seeing "Invalid Security Token Error 403"

We are seeing an increasing number of reports, in Blogger Help Forum: Get Help with an Issue, about problems accessing various dashboard features.
Recently I have faced a problem on my blogs dashboard. The problem is
Invalid Security Token Error 403
How do I solve this?
This blog owner faces the latest variant of the long feared monolithic error, "403 Forbidden".

Like the classical "403 Forbidden", "403 Invalid Security Token" is a network error, informing the client "You are not permitted access to this computer (server)".

Past instances of "403" errors have involved responses by Google, to malicious network traffic, from computers that are not controlled by their legal owners. This symptom was first discussed long ago, in 2007.

We now have a new Rollup Discussion, in Blogger Help Forum: Get Help with an Issue, where we are requesting details, from everybody who is experiencing this problem. If you are seeing this error, your details, politely provided, may help Blogger Engineering to identify the cause of the problem.
(Update 9/10): This problem appears to be resolved.

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