How can I reset the DP-300U with no access to the unit through Internet Explorer

Ethernet/USB Print Server it is for even windows 98 (OMG )
page 7 is setup.
NO OS stated by you, at all. why:?
page 3 is OS compat.
after reset the default address is
192.168.0.10
5volt power pack is NOT OPTIONAL.
1998
what did you read the free manual yet.
the last page shows printer compatibility list, does your match?

where would you find a printer that old working now.
crickets...???
my guess is 2003 year made. XP first release is that.
one manual for it stamped 2003 so is 17 years old
relic fodder for sure, recycle it is best.
first hit
https://eu.dlink.com/-/media/consumer_products/dp/dp-300u/datasheet/dp_300u_datasheet_en.pdf


RTM ! no 17 year old printer works today, not really.

Can anyone tell me, what IP Address when reset to default? thx's...

Try using the PSAdmin software to do a factory reset (download it from the internet if you need to). If it demands a password try the following:

password: SYSXXXX (Where XXXX is the last four digits of the MAC address, which can seen on the underside of the server)

I learned about the password part from http://www.fixya.com/support/t224263-dp301p_psadmin_password_forgoten, which has additional helpful details.

dear
Better way when you take new dp 300u unit in box cd in cd admin software run you can reset button is there please check

Try using the psadmin software to do a factory reset. If it demands a password to do this, try using "SYSxxxx" (where xxxx stands for the last four digits of the MAC address written on the underside of the server. If you don't have the psadmin software you may be able to download it off the internet. After doing the reset you will need to follow the Quick Install Guide to set up the server. If you lost the Quick Install Guide you can download a new one from D-link's website. The following link may also be helpful: http://www.fixya.com/support/t224263-dp301p_psadmin_password_forgoten

DP 300U's can get be pretty uncooperative when attached to a different router. One solution is to reset the DP 300U to its factory settings. Use the PS Admin software to do this. (If you lost the PS Admin software, you should be able to download it from the internet.) If the software prompts you for a password and you do not know it, try "SYSXXXX", where XXXX is the last four digits of the MAC address located on the underside of the print server.
After you reset the DP 300U you will need to set it up from scratch, a process which is not particularly intuitive. Refer to your "Quick Install Guide" (download it from D-link's web site if you don't have it anymore).

So... you've messed up the IP address on your DP-300U and now you can't even access the web browser configuration page? Yes, it's happened to the best of us. Although I'm sure there are more elegant solutions, one fix is to reset the server to its factory settings and then reconfigure it from scratch. Given that there is no reset button on the DP-300U, resetting can be frustrating, especially if it's asking you for a password that you never created in the first place! Here's what you can do...

1) Install the psadmin software which came with the print server. If you lost the software, you should be able to find it on the web somewhere.
2) Start the software. It should automatically locate your print server.
3) Click on "factory reset". If it demands a password, and you don't know it, try "SYSxxxx" (where xxxx is the last four digits of the MAC address written on the underside of your server)
4) Dust off your Quick Install Guide and go through the unintuitive configuration process. If you no longer have your Quick Install Guide you can find it on D-Link's website.

Good luck!

You may use the PSAdmin software to configure your print server even if you don't know the IP address. The only requirement is that the DP-300U has to be in the same network (subnet) as your PC running PSAdmin. In the PSAdmin, you will then be able to view or change the IP address.

Here is the link to download PSAdmin:
http://support.dlink.com/products/view.asp?productid=DP%2D300U#apps

Remember that if you also have forgotten the Admin password, you will have to ship the unit to D-Link in order to have it factory reset.

The DP-300U can be accessed with the password SYSxxxx, where "xxxx" is the last four digits of the unit's MAC address. The MAC address can be found printed on a sticker on the bottom of the unit.

check to see if you have Proxy server in your internet explorer settings ... if you're using proxy server then disable it to gain access to the web interface