I'm a service engineer at wits-end with a particular problem and hope you can help me.
We have a percentage (about 20%) of dial-up customers experiencing a problem from incomplete zip files downloaded from our server. The zip files are received at about 80-97% complete but the status bar on the receivers end indicates 100% complete. In one case, the status bar indicated about 2 minutes left in the download and then suddenly moved all the way over to incated it was "Complete". The zip file was several thousand bytes shy of complete.
The zip files contain JPG images and range in size from 500KB to 40MB. The problem began to occur in mid-April of this year and seems to reoccur with the same dial-up customers. However, the problem is random and the customers may attempt the download 2-3 times and then suddenly the file downloads complete without a problem. The problem is never noticed until there is an attempt to open the file. Then it is noticed to be corrupted.
The downloads are on "https" and there is a proxy server. The customers are on various ISP's and operating systems and browsers. The problem occurs in no particular time zone and at all times of the day and night. The problem does not occur with customers using high-speed connections such as DSL and cable. Some of the issues already investigated are:
- Old modem drivers
- Proxy time-outs
- Browser settings
- Anti-Virus software
- Bandwidth problems
This problem does not affect all of our dial-up customers, only about 20% and it does not affect them 100% of the time. If the files are moved out from behind the proxy and off the secure protocol, the problem stops. However, this is not an option. Help!
We have a percentage (about 20%) of dial-up customers experiencing a problem from incomplete zip files downloaded from our server. The zip files are received at about 80-97% complete but the status bar on the receivers end indicates 100% complete. In one case, the status bar indicated about 2 minutes left in the download and then suddenly moved all the way over to incated it was "Complete". The zip file was several thousand bytes shy of complete.
The zip files contain JPG images and range in size from 500KB to 40MB. The problem began to occur in mid-April of this year and seems to reoccur with the same dial-up customers. However, the problem is random and the customers may attempt the download 2-3 times and then suddenly the file downloads complete without a problem. The problem is never noticed until there is an attempt to open the file. Then it is noticed to be corrupted.
The downloads are on "https" and there is a proxy server. The customers are on various ISP's and operating systems and browsers. The problem occurs in no particular time zone and at all times of the day and night. The problem does not occur with customers using high-speed connections such as DSL and cable. Some of the issues already investigated are:
- Old modem drivers
- Proxy time-outs
- Browser settings
- Anti-Virus software
- Bandwidth problems
This problem does not affect all of our dial-up customers, only about 20% and it does not affect them 100% of the time. If the files are moved out from behind the proxy and off the secure protocol, the problem stops. However, this is not an option. Help!