Not that I am aware of. you would have to wait for them to clear the data base of non active names over X amount of days.. No idea when that is or if they even do that, but who knows you might be getting the name and password right. its just your unit being dumb. Like I said it would be much easier for me to work on it if I was able to remote in to a PC for you. Ill try a few things I know that might work. If you want you can try these, I wont go in to SUPER detail on them, more of a this -> this -> this thing
ATTEMPT 1;
Create a new user, add them to the admin group. reboot linkstation, login as the new user, go to webaccess, advance, use your settings, disable UPNP, set internal port as 9000, set external port to whatever you want. Choose a port between 2000 - 65000, Dont choose a port you are already using. See if it takes the settings. If so try to access it locally and then externally, Let me know if this worked or not and if it worked, did the external access work as well?
ATTEMPT 2:
You will need to download this firmware. Its not the newest, the newest is 1.69 which i believe you have. I want to go down a firmware version to help clear anything in the unit.
http://buffalotech.com/support-and-downloads/download/ls_series-168.zipYou will then need to follow the steps for "NEWER MODELS" on the link below, do not use there downloads. Just scroll down and follow the guide.
http://m1econsulting.com/knowledge-base/force-update-buffalo-linkstation-nas/When you get your LSUpdater setup and have the debug window open, Make sure all the boxes on left are checked, and then check all the boxes on the right EXCEPT FOR "REBUILD PARTITION", leave that unchecked, i REPEAT, leave that unchecked, if you check that and do the updated. Your data will be deleted. Also do not put a 0 in "NOFORMATTING" unless you don't care about your data. If you have your data backed up already then follow ATTEMPTED 3. The unit will take a few minutes after you run the update with the options you set. After it comes up. Login, make sure your share folders are there. This shouldn't delete any data. Now go head and try webaccess again.
If none of that works follow below,
ATTEMPT 3:
Back up all your data and then do the force update but you will set "NOFORMATTING" to 0, and put a check in force update and do not check version. This will make your unit start off as if it was your first time setting it up. Create a share and setup webaccess. If it works. xfer your data back over.