Login Trouble: Can do some places, not others

I’m using the latest, greatest ( it IS pretty good ) wordpress blog software at the host I use for my web site.

I have no trouble logging into my blog (not on wordpress.com ) at home.

I have no trouble logging into other wordpress.com blogs either at wordpress.com or using the wordpress software at other sites ( like I do ).

My problem happens at work. I can’t get into the admin interface.

When I log in, the log in page just cycles back to me with no error messages. When I go to my blog it shows me as logged in and I can even post comments. I just can’t get into the admin interface.

I’m guessing that is something the network people are doing at my job.

My questions are:
1. What are they doing specifically?
2. Is there a workaround for this issue?

Thanks much in advance for any info