Can't access company server

If this is in the wrong place, please tell me. If this has been covered, please direct me to the correct thread as my attempts to search have not fruited anything (I suspect I don't know the correct terminology to use). I am technical for an END-USER, that's it so I don't understand many things - ie, some utilities apps/etc.
I was recently hired on at a company of 25 employees, all PCs. I have a Macbook Pro (OS 10.4.9, 2.13 ghz), was assigned a username and password for the network but can't really access it. I see aliases for the different areas with correct names but when I try to access them, first it asks for my user/password and then I get a message that the original location can't be found and it asks me to fix the alias, delete the alias or press okay.
IT Administrator has no idea.
There are 4 printers on the network. For some reason, I can access one (it just has to be the one on another floor :)), and I don't need an ethernet attatchment, it gets to it wirelessly somehow.
I have company email on the server, my browsers (both Firefox and Safari) can't access it remotely or internally)
HELP!!
Greg

I have company email on the server, my browsers (both
Firefox and Safari) can't access it remotely or
internally)
This looks like the easiest one to try and fix first - which may help with the others.
Presumably you have an imap account, accessed normally by webmail browser. However, you should be able to also access via an imap account in Mail, even if just to test (some functionality may only be available via web browser). The latter just needs an IP address for the server (rather than getting this via DNS).
Go to Apple Menu-> About This Mac-> More Info-> Network (left hand pane). Select 'Built-In Ethernet' (top right hand pane). In bottom right pane, CHeck the entries for...
IPv4: Addresses (your IP), Router, Subnet Mask
DNS: Server Address
DHCP: Domain Name Servers, Routers, Server Identifier
Ask your IT to confirm these are as they should be. Post content if you want comment back (these should all be local IPs with no security implications for letting us see them).
-david
PS. Above presumes you are plugged into ethernet network.

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who can help me ?
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Hi:
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I can connect to the XServe's AFP server from my Mac over our wired and wireless network. The AFP server shows up in the sidebar of Finder windows. So far, so good.
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"I am able to successfully connect to our network via the VPN with Mac OS X 10.5.2 client (on two different machines) using L2TP through our network's firewall (on a Netopia T1 router; UDF ports 500 and 4500 and IP Protocol 50 and 51 are open) using a shared secret."
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"Unsupported protocol 0x8057 received"
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The netmask is used by all nodes to determine how big your subnet is: what part of the IP number is the network number and what range the node number is in => really: should traffic be directed to a node on the same LAN or sent directly to the gw/router for forwarding.
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Try your settings at http://www.jodies.de/ipcalc to see what I mean.
"...lists the router as having the IP address of the XServe (rather than the router on the network). Is that normal?"
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"The firewall for the 10.5.2 server is not running (but will be once I get this all working)."
If you already have a firewall in front of your servers that is a bit redundant.
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DNS is needed for your servers forward and reverse names/IPs for advanced services but doesn't need to run in any of your own servers.
If you decide to do a split tunnel VPN config (adding public and private routing definitions) a reachable DNS IP for VPN clients (in VPN config on server) is needed for VPN clients or they can't use names to find anything. To reach this DNS IP if public/not on your server LAN, you need your server to forward IP DNS lookups and have a routing definition for it.
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Here are my firewall rules (Four keep-state rules, very general though) :
00001 allow udp from any 626 to any dst-port 626
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12315 allow udp from any to any dst-port 25
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12319 allow tcp from any to any dst-port 587
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12323 allow tcp from any to any dst-port 5433
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Can't access company server

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