Problems crawling my pages for XML Sitemap

Spider simulators (all of them) seem to struggle

[Munster]

I have a site that I've been trying to generate an xml sitemap for, and every crawler tool I have tried comes back with absolutely nothing. I'm Stumped, could it be the type of links that are being used?

Below are some examples

ul>
<ul class="noindent">
<li><a href="/xx/genericContent.do?contentId=registration.sm083">Register</a></li>

<li><a href="/xx/genericContent.do?contentId=.howdoi.sm089">How</a></li>

<li><a href="/vm/vm/setups.do?contentId=setting.up.sm101">Settings</a></li>


</ul>

To me they look ok and it seems that something else must be stopping the pages being crawled.

Any suggestions?

M