https://login.veeam.com/en/oauth?client_id=nXojRrypJ8&redirect_uri=https%3A%2F%2Fwww.veeam.com%2Fservices%2Fauthentication%2Fredirect_url&response_type=code&scope=profile&state=eyJmaW5hbFJlZGlyZWN0TG9jYXRpb24iOiJodHRwczovL3d3dy52ZWVhbS5jb20va2IxNzgxIiwiaGFzaCI6IjE3ZjM2OTE0LTA5ODktNGY0Yi04OTNkLWZmMzhiZTU1MmI0YyJ9
1-800-691-1991 | 9am - 8pm ET
EN

Connection forcibly closed by remote host

Challenge

While a job is processing, a job might intermittently fail while sending data from the source proxy to the target proxy/repository server with:
<   744> srv| ERR |Server session thread has failed.
<   744> srv| >>  |An existing connection was forcibly closed by the remote host

Cause

This is related to a networking issue between the servers. These errors are most common when going across a WAN network, however can occasionally happen locally as well.

Solution

Typically this issue is related to packet loss somewhere on the network between the two servers. There are some utilities to test the line, however involving the ISP or networking team is typically helpful.

Some common tools typically recommended for testing are Iperf as it can give quite a bit of information about the network connection and Wireshark.

Another possible issue could be related to the Microsoft tcp/ip stack. In very rare instances, the following registry key has been used successfully when the network was not experiencing any issues:
http://msdn.microsoft.com/en-us/library/ms187005%28v=sql.105%29.aspx
Open regedit and navigate to the following location:
HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Create a dword (32 bit) value:
SynAttackProtect
Leave Value set to 0 to disable this feature
KB ID:
1781
Product:
Veeam Backup & Replication
Version:
6.x, 7.x, 8.x, 9.x
Published:
2013-07-05
Last Modified:
2020-08-13
Please rate how helpful this article was to you:
5 out of 5 based on 1 ratings
Thank you for helping us improve!
An error occurred during voting. Please try again later.

Couldn't find what you were looking for?

Below you can submit an idea for a new knowledge base article.
Report a typo on this page:

Please select a spelling error or a typo on this page with your mouse and press CTRL + Enter to report this mistake to us. Thank you!

Spelling error in text

Knowledge base content request
By submitting, you agree that your personal data will be managed by Veeam in accordance with the Privacy Policy.
Your report was sent to the responsible team. Our representative will contact you by email you provided.
We're working on it please try again later