ive just taken over the lease of a cafe which has cctv installed. the previous owner left no software for the unit but i managed to get it from there website. but when i try to log in to the unit it says connection error. 
the unit is avtech h264 and ive connected to laptop via ethernet to set up to new modem. if i search in video viewer if finds the unit no problem. im wondering if i need more software besides video veiwer but on there web it says i need video veiwer only 
  
according to manual username is admin 
pass is admin 
now i dont know if previous owner has changed them and i cant get in touch with him as hes moved abroad 
  
any help or advice appreciated