I set up an ASUS WL-500gP with original ASUS firmware to my LAN with IP address 192.168.1.1. If I navigate to address http://192.168.1.1:8080/ in my Firefox address bar, an Authentication required window opens up asking for "User name: " and "Password: ". Correct "User name: " is "admin" and correct "Password: " is "pA55w0Rd". They work fine if I type them in manually to the Authentication required window, but for I can't get in using the hydra with words.txt password file, which contains "pA55w0Rd":

Code:
[root@ ~]# cat words.txt
password
user
pA55w0Rd
Admin
Administrator
[root@ ~]# hydra -s 8080 -l admin -t1 -v -P words.txt -e ns -f 192.168.1.1 http-head /
[VERBOSE] More tasks defined than login/pass pairs exist. Tasks reduced to 7.
Hydra v6.1 (c) 2011 by van Hauser / THC - use allowed only for legal purposes.
Hydra (http://www.thc.org) starting at 2011-03-29 13:12:11
[DATA] 7 tasks, 1 servers, 7 login tries (l:1/p:7), ~1 tries per task
[DATA] attacking service http-head on port 8080
[VERBOSE] Resolving addresses ... done
[STATUS] attack finished for 192.168.1.1 (waiting for children to finish)
C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46
User-Agent: Mozilla/4.0 (Hydra)


C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46YWRtaW4=
User-Agent: Mozilla/4.0 (Hydra)


C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46cGFzc3dvcmQ=
User-Agent: Mozilla/4.0 (Hydra)


C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46dXNlcg==
User-Agent: Mozilla/4.0 (Hydra)


C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46cEE1NXcwUmQ=
User-Agent: Mozilla/4.0 (Hydra)


C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46QWRtaW4=
User-Agent: Mozilla/4.0 (Hydra)


C1:HEAD / HTTP/1.0
Host: 192.168.1.1
Authorization: Basic YWRtaW46QWRtaW5pc3RyYXRvcg==
User-Agent: Mozilla/4.0 (Hydra)


Hydra (http://www.thc.org) finished at 2011-03-29 13:12:12
[root@ ~]#
So looks like I ran into the same issue as well