I recently migrated my site the upgraded Mollom to 6.x-2.0 and got the message "Invalid API keys" with the logs saying network errors.
I have seen this:
None of the suggestions work for me. However, downgrading Mollom to 6.x-1.16 fixes the problem.
My set up:
Drupal 6.x.26 on Apache (Redhat).
Has anyone else experienced this and found a work around. For now I have version 6.x-1.16 but would like to upgrade to 6.x-2.0
I have even recreated the public and private keys on Mollom.com but it did not fix the problem when on 6.x-2.0