Trackback and Ping issues

I’ve recently moved my blog to a new server and domain and I seem to be having some difficulties with trackbacks and pings, though quite why this is I can’t fathom.

When I trackback to someone else’s blog the trackback never appears in their comments (this could be their moderation in some cases but in others I am told reliably that it isn’t). Similarly trackbacks to my blog don’t appear in my comments or moderation queue.

Finally I’ve noticed that for some reason Technorati isn’t spidering my blog, even if I ping it manually.

If anyone can shed some light on the reasons for this I’d be more than glad to hear from them.