Title. Trying to change my subscription and I can't. I can access all the other stuff fine, but the "Manage Subscription" page here on the site gives me an XML error.

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Error>
<Code>RequestHeaderSectionTooLarge</Code>
<Message>Your request header section exceeds the maximum allowed size.</Message>
<MaxSizeAllowed>8192</MaxSizeAllowed>
<RequestId>S5XZQKB3VB3TQ3N4</RequestId>
<HostId>/pqpi9CvOQ4+FFy00srzt+02yI2+5TEKquIBgk07GO94VnU1fAVcayp97OtJd0qq9Oq42v5clX4=</HostId>
</Error>