By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Big losses from network-equipment maker Infoblox Inc. and Web-hosting company Rackspace Hosting Inc. stood out among tech stocks Tuesday after both companies gave weaker-than expected earnings outlooks.

Infoblox (BLOX) plunged by more than 47%, to $17.57 a share, after the company said late Monday that it expects to report a second-quarter profit of 10 to 12 cents a share on revenue between $60 million and $61 million. Wall Street analysts had forecast Infoblox to earn 10 cents a share on $65.7 million in sales for the quarter. Infoblox Chief Executive Robert Thomas said the company suffered a shortfall of business in January, with fewer deals worth $1 million or more than had been expected.

Needham & Co. analyst Alex Henderson cut his rating on Infoblox to hold, and Sterne Agee analyst Alex Kurtz lowered his rating on the company's stock to neutral from buy saying evidence suggests that "lack of projected [2014] growth is a deeper issue internally than merely a few key deals slipping during the quarter."

Rackspace (RAX) shares fell by 15%, to $34.27 after the Web-hosting company on Monday said Chief Executive Lanham Napier would retire and be replaced by co-founder and former CEO Graham Weston. Rackspace also said it would continue with shifting toward being a cloud-software developer. Rackspace also forecast weaker-than-expected revenue for all of 2014.

Groupon Inc. (GRPN) was also in the red, falling more than 6% to $10.35. The daily deal and e-commerce company said in a Securities and Exchange Commission filing on Monday that Jeff Holden, its senior vice president of product management, will leave the company on March 18.

Losses also came from eBay Inc. (EBAY), Amazon.com Inc. (AMZN), Netflix Inc. (NFLX) and AOL Inc. (AOL).

However, the overall tech sector advanced, with gains from Apple Inc. (AAPL), Yahoo Inc. (YHOO), Hewlett-Packard Co. (HPQ), Microsoft Corp. (MSFT) and IBM Corp. (IBM). The Nasdaq Composite Index (RIXF) rose 13 points to 4,161 and the Philadelphia Semiconductor Index (SOX) was up by almost 1%.

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